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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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 ...
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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 ...
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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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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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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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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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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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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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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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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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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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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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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 ...
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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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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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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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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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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 ...
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2answers
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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 ...
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1answer
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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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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 ...
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1answer
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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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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 ...
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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
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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 ...
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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....
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1answer
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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 ...
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1answer
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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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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 ...