Questions tagged [percentages]
A percentage is a number or ratio expressed as a fraction of $100$. It is often denoted using the percent sign, "$\%$", or the abbreviation "$\mathrm{pct}$." -Wikipedia. Percentages are used when describing portions or proportional changes.
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1answer
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Problem of percentages [on hold]
Can someone explain why: 100% of 10 = 10% of 100
or
78% of 5 = 5% of 78
Open to any explanations of this
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0answers
12 views
Formula to determine an item's price after a discount was applied on an aggregate [on hold]
I'm developing an application and one requirement is to find each item in an order price after a discount was applied.
I'm looking for the formula
Assuming the following input.
Have a 5 dollar ...
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1answer
52 views
How to explain '200%' mathematically [on hold]
I heard people say:
It is 200% true.
This means it is twice the true than it is supposed; often metaphorically.
But in maths:
X% means, X out of 100
**
How to think about200 out of 100.**
Please ...
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2answers
25 views
In an election there are 1080 votes, 5 electoral candidates but only 3 available seats. Calculate minimum number of votes needed to guarantee a seat.
I've received this grade school math problem but unfortunately algebra cannot be used. I am somewhat stumped and not convinced with my own answers. Here goes:
At a grade school election, there were ...
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1answer
17 views
Calculate what the new number should be
If I know that the price for a particular product is $1750 WITH a 35% discount
How can I found out what was the original price? This is probably a simple answer but I i have tried getting 35% and ...
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1answer
41 views
Stupid question but unsure on Regression.
When I want to do a regression between daily change of currency prices and a daily stock index changes which one shall I use as the dependent and independent variable. Thanks for any help.
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1answer
20 views
Sample points logarithmically between a a range of y values
I'm sorry if this a simple question but I couldn't understand the math from example graphs I read online.
Example numbers to make this easier:
Assume x = 0 to k (but let's assume k = 20)
Assume y ...
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0answers
15 views
NCAA Bracket Odds of 2 Separate Occurrences Happening.
Ok so i'm trying to do some NCAA bracket odds and I have 6 separate things that have a certain percent chance of happening. The percentages are: ...
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1answer
25 views
How to get probability for “at least one” from multiple different percentages
I am trying to figure out some odds for a march madness bracket and I got stuck. I have a list of 6 things that could happen and each of them have different odds of happening (ranging from 85%-3%). I ...
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1answer
16 views
weight of ideal soil (given 2 different densities)
QUESTION - What is the total weight, in pounds, of $1$ cubic meter of an ideal soil including the soil solution. You can assume that the particle density of the soil solids = $2.65$ Mg/cubic meter and ...
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14answers
4k views
Is the percentage symbol a constant?
Isn't the percentage symbol actually just a constant with the value $0.01$? As in
$$
15\% = 15 \times \% = 15 \times 0.01 = 0.15.
$$
Isn't every unit actually just a constant? But why do we treat ...
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0answers
33 views
How to divide a number per zero using another informations
everyone is well?
My background for this questions is:
I have a number of sent files, also I have a number of expectedly sendt files and finally the percentage of files, so I have:
sent/expected (...
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1answer
15 views
Formula for contamination scoring system
I am trying to create a scoring system to show how contaminated a sample is.My aim is for the formula to yield one overall score, to indicate how "concerning" a sample is, i.e. the more it is ...
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1answer
26 views
Percentage split among years
Someone tells that over the next 10 years the value of a house will lose 13%.
So if the value is 10000 now, the value after 10 years will be 8700.
Now I want to generate the following table
...
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3answers
69 views
Is “30 times more likely” equivalent to a “3000% greater probability”?
I am trying to make a persuasive point based on facts and would like to be most accurate / clear in my point. Would "30 times more likely" be equivalent to a 3000% greater probability"
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2answers
41 views
A is x% more than B
I am taking the AMC10 test, and I don’t want to lose points on silly misunderstandings. When a question says “A is x% greater/less than B”, or things like that sometimes with money, which respect ...
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0answers
19 views
That is the value of an annuity?
The person is gaining $1000 $ on the 1st day of every month (annuity) from 2015.12 till 2018.05.31, but 2015.12 the person wants to get $1000 $ twice - on the 1st and on the 15th day of December. Find ...
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1answer
28 views
Percentage of Common [closed]
How can I calculate the percentage of in this case If 120 things are common between 149 and 160. what would be percentage of common things?
I calculated it like this 120*100(120+(149-120)+(160-120))= ...
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1answer
25 views
Proportional percentage increases in groups
If I have 4 gases in an atmosphere, lets say:
A makes up 78%
B makes up 21%
C makes up .93%
D makes up .04%
If the percentage of gas D increases to 5%, how do I find the proportional percentage ...
0
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0answers
12 views
Finding the percent probability of completing BUDs training
I came across a website with physical events that coorelate with the success of completing BUDs military training. There are 1291 total candidates. There are 13 physical events. Each physical event ...
0
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1answer
23 views
Percent of percent chain
Start out with a number, for example 458.
The number is reduced by 1% 35 times, so:
458
453.42
448.89
...
322.18
How can I calculate final number without doing a step-wise reduction?
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1answer
12 views
Percentage Change vs. Percentage Difference
So in this particular scenario, I have two processors running the same benchmark. One is faster than the other, with the faster result being the one that takes the least amount of time to complete.
...
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0answers
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How to find 0-100% of a range that runs from -4.6% to 109.5% [duplicate]
I have the following numbers taken from a simulation of control positions:
Full forward position: Displacement 22.7 cm at -4.6%
Full Aft position: Displacement 44.1 cm at 109.5%
I want to be able ...
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0answers
14 views
determining a price point for in-game items
I am trying to determine the best price to charge for items on my vendor in a game called "Legends of Aria".
I use an HP48 calculator for most of my math problems, but this one is a bit more ...
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1answer
24 views
Calculating number from one collection basing on a nother collection number
I have a collection of numbers between 19.75 and 20.25 and a number that is between that borders lets say its 20.10.
Now basing on that need to calculate equivalent of that number (20.10) but in ...
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0answers
5 views
Find Net from Gross and Percentage
I've looked into search engine but could not find my question, most of the questions is about finding gross, not net. So what is the equation to find net value when I know gross and percentage.
For ...
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0answers
11 views
I want to calculate the depreciation value over 3 months
if the price of a mobile device was
1000 on September 2018
and the price depreciates (decreases) by 7.2% every month
what is the formula to calculate the price now? (Jan 2019) after 3 months.
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0answers
22 views
Approximating values while calculating percentage changes
At times, in certain types of data interpretation questions that usually get asked in aptitude examinations, some techniques are employed to cut time on calculation and get a near perfect answer. One ...
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1answer
21 views
How to compute the percentage of improvement
Sorry if my question is obvious, but I really need to know the answer. I have proposed a load balancing algorithm for decreasing the value of response time. For example imagine the response time of ...
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1answer
30 views
Average calculation
I know it will be a stupid question for somebody but I need to understand.
Below the matrix:
$$ \left[
\begin{array}{cc|c}
55&0&0\\
55&0&0\\
15&8&53\\
15&4&27\...
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0answers
11 views
Question about NBA lottery picks and percentages
Question:
team1 has a 9% chance at getting the top pick.
team 2 has a 3% chance at getting the top pick
If team 1 trades a player for team 2’s pick does team one now have a 12% chance at the top pick?...
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2answers
45 views
Why can the Potato Paradox be quantified as $0.99⋅100−0.98(100−w)=w$?
I understand the two Simple Explanations, but not Algebraic Explanation Method 2. I substitute $x$ in Wikipedia with $w$, as $x$ is already used for another method.
The weight of water in the ...
2
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3answers
108 views
Why can the Potato Paradox be quantified as $1 + \dfrac{98}{100}{x} = x$?
I understand the two Simple Explanations, but not the Algebraic Explanation Method 1.
After the evaporating of the water, the remaining total quantity, $x$ , contains 1 lb pure potatoes and $(98/...
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1answer
47 views
Does the Potato Problem assume 1% water = 1 lb of water?
The Universal Book of Mathematics states the problem without saying anything of the mass of water or potatoes:
Fred brings home 100 pounds of potatoes, which (being purely mathematical potatoes) ...
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2answers
48 views
Meaning of success rate
What is the meaning of success rate?
ex: success rate = 4%
Someone told me it means doing something 100 times consecutively and that there would be at least 4 times it succeeds.
But I think its not ...
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1answer
17 views
How many times based on two different percentages
Following is a percentage of a total population.
X: 58%
Y: 22%
Z: 20%
In Garden:
X: 30%
Y: 27%
Z: 43%
I want to calculate How many times Y is more likely in the Garden? The answer will be like ...
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1answer
26 views
Formula to calculate change in distance to destination or origin of a straight-line path of travel
I am writing an application that consumes GPS data - and I am trying to calculate direction traveled based on a change in distance to the destination and origin.
Assume that I have a straight path of ...
2
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2answers
57 views
How to calculate the value of a coin? [closed]
I do not need a specific answer, but a global formula that solves this equation.
There is a coin that costs 100\$ (or 5\$ or \$25 etc.) Each year, it steadily increases by 10% (or 1% or 4% etc.) How ...
0
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1answer
14 views
Find Original Value using result of discounted discount [closed]
Am trying to build an excel sheet where I have an known Target Price (TP) that I want to achieve but don't now how to get the Original Price (OP).
TP = (OP - 10% discount on OP) - 20% fee on ...
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3answers
29 views
Rounding a percentage to the nearest multiple of $\frac{1}{n}$
If I take a percentage like $60\%$ I can easily round it to a multiple of $\frac{1}{n}$ where $n=2$ like this...
$$60\%\doteq50\%$$
$$50\%=\frac{1}{2}$$
...or where $n=3$ like this.
$$60\%\doteq 66\...
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3answers
38 views
Finding percentage increase of area [closed]
Find the percentage increase in the area of a triangle if its each side is doubled?since no information is given about the type of triangle in question, so should i take a equilateral or isosceles or ...
0
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1answer
18 views
Calculate total percent change from incremental changes
Is there a formula to calculate a total percent change of a value from multiple changes?
Example:
Initial: 100
-10%: 90
+5%: 94.5
-20%: 75.6
So I am looking for ...
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votes
3answers
39 views
Derive Compound Interest Formula [closed]
I'm trying to derive Compound Interest Formula
$100 is given
1% interest per month
I can manually work this by hand (and Excel)
See how the formula just expands?
How to create simple formula such ...
0
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1answer
28 views
Theroretical percentage overlap
I've spent a long time searching but cant find any information. I'm probably searching the wrong terms.
Example:
If 50% of chairs are red, and 25% of chairs are tall. What percentage of chairs are ...
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2answers
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What does the relationship between dividing percentages signify in this problem?
The following is an example calculation from Wikipedia's page on Percentage:
I understand everything up to the point where 3% is divided by 10%. I cannot seem to understand why these two percentages ...
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0answers
41 views
statistical analysis
Let's assume we have a (MOBA) video game like (League of Legends).
And we have a big analysis table of champion data.
Now we pick the data of a specific champion, and look at the 70.000 games played ...
1
vote
1answer
33 views
Apply “buy X get Y” discount on N products
Consider a product is added to a cart with quantity of N and "Buy X and get y" offer is applied i.e. Buy two get one free.
If n = 3 then I could simply apply a discount rate of 33.33 on each product....
0
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1answer
75 views
How to calculate probability of winning bowl pool?
I currently have a spreadsheet that keeps track of players and their respective picks as to who they think will win each college bowl game. At the beginning, before any game is played, each player has ...
0
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1answer
28 views
Strength of salt in a mixture is p%. Various concentration of slats are added
The strength of a salt solution is $p$% if $100$ ml of the solution contains $p$ grams of salt. If three salt solutions A, B, C are mixed in the proportion $1 : 2: 3$, then the resulting solution has ...
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0answers
23 views
Mixing two different essential oils to their maximum safe dilutions in one carrier oil
I want to mix cinnamon bark essential oil (safe at a maximum 0.5% dilution) with tea tree essential oil (safe at a maximum 15% dilution) in shea butter.
Shea butter is safe undiluted. The above ...
