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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Percentage evaulation Queestion from GRE

A question from GRE book says: A candidate who gets 30 percent marks in an examination fails by 30 marks,but another candidate who gets 42 percent marks get 42 more marks than necessary for ...
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Compare sales growth

So I’m trying to measure the sales growth of specific salesman. Any salesman has the highest sales growth (min $4\%$) will receive a giftcard. However I found it not fair to compare when a saleman ...
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14 views

How to figure out a formula for percentage?

Let's say I want to go shopping and all I have is $15.00. The rate that I will be taxed at, on my purchases is 8.25%. I would like to know the formula to figure out what I can spend, less the ...
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How do I figure a percentage increase? [on hold]

What is the percentage of increase from 750 to 1000 and how do I figure that out?
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34 views

Why does increasing a number by 15% and then decreasing it by 15% fail to produce the original number?

I start with number: $.425$ and I want to add $15\%$ to get a new number. $.425 \times 1.15 = .489$ However, when I reduce $.489$ by $15\%$ I don't arrive back at $.425$. $.489 \times .85 = .416$. I ...
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How to compute Final Grade with assignment weightings?

I have just finished the Final for my Computer Hardware course, and I'm trying to figure out where my grade currently stands. The way the class is broken up is 50% weight for the homework, 25% for the ...
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The Car's cost is 9,00,000 and it is inclusive of local tax of 2%. How to find the original value of car?

The Car's cost is 9,00,000 and it is inclusive of local tax of 2%. How to find the original value of car? As far as calculation goes I calculated it as below 2% of 9,00,000 is 18,000 Final ...
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8 views

percentage including money and profit

I bought a bike for 30 Euro, the next day I sold the bike for 250 Euro, What percentage profit did I make in percentage? my friend say that he got for his answer 733,3 percent but I said that I got 73 ...
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Subtracting 30 percent of which number gives 2000?

Subtracting $30$ percent of which number leads to $2000$? $$x - (30 \text{ percent of }x) = 2000$$ for example: $$4000 - (50\text{ percent of }4000) = 2000$$
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16 views

Complex percentage [closed]

I am trying to create a companion app for a game made by a group of indie developers. I have to calculate the probability that a player obtains a certain item. I know that you have a 7.80% to find ...
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0answers
10 views

Adjusting with Multiple Variables

I need to adjust a bid based on a number of factors that include time of day, day of week, and average rank. Each factor has a different level of importance in terms of the final adjustment. All the ...
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1answer
14 views

Matlab %e meaning

What does %e mean in matlab? I.e: x = %1.25e I know if you put an e at the end it adds 0s, so does it have something to do with that?
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7th grade percentage question

In the year $2010$, John's monthly salary was $\$3500$. John's monthly salary in $2010$ was $25\%$ more than it was in $2009$. Calculate his monthly salary in $2009$. Many of us debated the answer ...
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31 views

Combinations of percentages.

How would I calculate all possible combinations of given percentages so that none of the combinations is less than 51%? For example one such combination of 24% 23% 21% 17% 8% 7% would be 23% + 24% ...
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12 views

Notation with regards to percentage and order of magnitude - little dot next to percentage sign.

Is anyone able to tell me if there is some notation that means 'an order of magnitude' or '/10' on a percentage value? I have a graph (see below) from a journal and the y-axis values are more than I ...
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14 views

Simple percentages

Ok, real simple stuff for all math lovers out there. :) Could anyone please show me if there is another way to calculate the problem below. Is it possible to use change/original price? I don’t like ...
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1answer
16 views

Calculating percentage change. Using average or endpoint values?

I have always been taught that when I need to find the percentage change of a value I should do $$ ΔX = \frac{X_{new}-X_{old}}{X_{old}} * 100\% $$ Yesterday however I was reading on price elasticity ...
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2answers
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Inverse Percentages, Percentage issue

A house is sold for 457000 dollars , which gives it a profit of 19%, find the profit? Could you guys please help? i know how to find the original price of something but I'm not sure how to find the ...
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1answer
16 views

Genetic Percentage

If a half-brother married a lady and then his half-sister married the ladies brother, what is the genetic percentage that the children share? I know half-siblings share 25 percent and full siblings ...
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Unweighted Mean of Percentages

I have come across an interesting problem, which I'm sure there must be a standard solution to, but lots of Googling hasn't yielded much (which may mean I'm well off track...). I am trying to ...
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2answers
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What equation do I have to put here to have an accurate increase of 4.7% every year?

I'm dragging this question over from another website from a recommendation. I'm writing a program in BlueJ that gets the starting price of Tuition in the first year ($8000) and for each year ...
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1answer
15 views

Conversion into percentage

I have a very basic algo wherein each person gives an opinion about an article which has a score. All opinions add up points to the article score. For example, If person says I like it, article gets 5 ...
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1answer
55 views

Percentages of percentages

I do not even know how to title this question, or the name of the thing i'm looking for, but here's an example: there's N participants we'll take just three into account, but i need a formula for N ...
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40 views

Probability problem on a cancer test.

There is a test to find out if a person has cancer. 1.) 95% of people who will take this test AND have cancer will get a positive ID that they have cancer. 2.) 2% of people who take this test who ...
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22 views

Percentage “change factor”

In my math work book there’s a section on, when translated into english, “percentage change factor”. I am looking for the actual name for it in English in order to search more info/help regarding ...
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1answer
26 views

Saving for retirement - how much?

I'm working through a problem in the book "An Undergraduate Introduction to Financial Mathematics" and there is an example I can follow. The problem is: Suppose you want to save for retirement. The ...
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32 views

College Interest rate by yearly payments

Problem A loan of 20; 000, made at an interest rate of 6%, is to be repaid by level yearly payments for 10 years, beginning 1 year after the loan is advanced. Just before making the seventh ...
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1answer
28 views

What's the percent of mango trees?

I know this is simple stuff compare to the questions I've seen on this site but please be nice. :) Would be great if anyone could show me how to solve the problem below. Question: On a piece of ...
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3answers
62 views

What is the meaning of percentile?

I am confused by the term percentile. Once my teacher told me that percentile means the percentage with respect to the score of the highest achiever. This means that if in a competition I got $80$ ...
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3answers
28 views

Complicated Percentage Question

In a certain town some people were affected by a ’flu’ epidemic. In the first month $20$% of the population contracted the flu whilst $80$% were healthy. In the following month $20$% of the sick ...
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18 views

How can I scale up a number to be the same percentage of another number?

I would like to scale up a number to always be the same percentage of a bigger number, if you get what I mean. I am making a start screen for my game, and basically I need the buttons to always be ...
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1answer
25 views

Is there any shortcut to find the % increase or decrease?

My current salary is 3000 and now it has become 3450. The traditional way is to find the difference and divide by the start(base) value to find out the percentage increase. 450/3000 which is 15%. How ...
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Can I use the following shortcut to find the increment in the percentage terms?

I have a problem like - My salary was 3000 per month. Now, it is incremented by 15%. Can I do the following to get the increase in salary quick? 3000 is nothing but 30 * 100. Now, increment by 15%, ...
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Average Cycle per Instruction

We have two different computers with the same instruction set. There are three classes of instructions (A, B, and C) in the instruction set. Computer M1 has a clock rate of 80 MHz and Computer M2 has ...
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35 views

Percentage of total voters captured by two political candidates

In an election, 2.8 million votes were cast and each vote was either for candidate I or candidate II. candidate I received 28,000 more votes than candidate II. What percent of the 2,8 million votes ...
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31 views

Average of percentages

I have a simple scenario as follows: If 12% of people buy a new computer each year, 33% of people buy shoes each year, and 39% of people buy a new phone each year, what percentage of people on ...
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1answer
12 views

Percentages in Normal Distribution

A statistics problem involves: Lengths of a certain type of carrot have a normal distribution with mean 14.2 cm and standard deviation 3.6 cm. (i) 8% of carrots are shorter than c cm. Find the value ...
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1/1000 chance of a reaction. If you do the action 1000 times, whats the new chance the reaction occurs?

A hypothetical example: You have a 1/1000 chance of being hit by a bus when crossing the street. However, if you perform the action of crossing the street 1000 times, then your chance of being ...
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1answer
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I need help, percentages, ratios, proportions.

A community center is going on a trip to Philadelphia via several buses. The ratio of men to women to children is 1:2:3. If there are 150 people going on the trip, how many men are going? How many ...
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3answers
45 views

How to find the total investment from interest received

Dave Horn invested half of his money at $5$%, one-third of his money at $4$%, and the rest of his money at $3.5$%. If his total annual investment income was $\$530$, how much had he invested? I found ...
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26 views

“reverse” percentage (go backward instead of forward)

I'm a bit stuck with calculations to my program here.. This is how it works today: http://dropthebit.com/demos/pathAnimator/index.html The object goes along the path, which the default is "forward", ...
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22 views

How to find a systems winning probability accurately & consecutive losses?

I'm not very good with maths, but i really need help in this. Pardon me if make stupid questions. How to find certain system winning probability accurately? I mean for an example, take a trading ...
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1answer
34 views

how to solve venn diagram without drawing it

The question is "90% of the students in school passed in English, 85% passed in Mathematics and 150 students passed in both the subjects. If no student failed in both the subjects, find the total ...
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1answer
28 views

Simple percentage calculation

This is an easy question, but since I grew dumb in the years, I ask for your help! :) A = 50% B = 75% C = 100% D = 125% E = 150% How can I calculate the value of any of these letters? I'm making a ...
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1answer
11 views

Percent Increase in time series

I want to compute percent increases on time series data, but I also want to take into account the absolute volume of the data. For e.g. suppose I have 2 sets of data (a) [10, 15, 50, 100] and (b) [1, ...
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4answers
132 views

How do you find the minimum percentage who have studied all four subjects?

At college, 70% students studied Maths, 75% students studied English, 85% studied french and 80% studied german. What percentage at least must have studied all 4?
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22 views

Formula or graph for decreasing percent change when a constant is added to variables

If the title doesn't make sense I will try to explain via example. There were 100 apples, 80 were purchased; 80% were purchased Add 100 to each, apples and purchases 200 apples, 180 purchased; 90% ...
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Scheduling teams to complete a percentage of work

I'm trying to work out how to allocate work to different teams, and my brain is struggling with the logic. I have three different teams who arrive in a geographic area at different dates. There's a ...
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19 views

Function to generate a score out of 100% based on other parameters

I am attempting to score an outcome out of 100%, which will be an evaluation of "risk" level. The factors would be (for example): if number of users increases, risk level increases if secure ...
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Percent profits and base costs: Word problems.

A table is bought for $23.50$, which includes a profit of $17.5 \%$. I need to calculate the amount of profit. I tried finding $17.5\%$ of $23.5$, but I don't think that's what's being asked ...