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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Squaring quantities with units

I am programming a script to an online store and a serious mathematical problem happened, and I cannot solve it! This is the problem: if a person has only 10 cents (on any monetary currency, I will ...
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13 views

Finding the Value of Ties

THE CHALLENGE If "Winning all the time = 1" "Losing all the time = -1" "Tie all the time = 0" What value would "Winning HALF the time" be? Is there an error in my original variables that would help ...
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1answer
12 views

Question of percentage to find a bonus number [on hold]

Eric is a director of a mining company on a salary of $\$380,000$ per year. Eric is told that at the end of the year he will receive a bonus of $1\%$ of his salary for every percentage point that he ...
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1answer
65 views

I need a mathematical percentage for a final exam grade, too see how many points I need for a $90\%$ average.

I have a math exam tomorrow. My current overall-average is $98\%$(A). The exam will be $15$ OR $20\%$ of the final grade. What percentage would I need on this exam to get at least $90\%$ (A-) as a ...
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1answer
24 views

Ratio vs Difference in terms of growth

Suppose we have the following data: start date end date quantity 01/05/2014 07/05/2015 5 07/06/2015 02/06/2016 8 What ...
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3answers
56 views

Any source for this formula?

I have never learned math through English as a medium of instruction, so my English math vocabulary is very poor. My problem: I had some data for different neighborhoods. For example: ...
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1answer
17 views

% of traversal for a point between two other points along a line

I'd like to solve for some "phase" or percentage, involving an arbitrary location (xC, yC) between two points. I'm not familiar with how to phrase this question, so please excuse my ignorance. Not ...
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0answers
19 views

Percentage Increase and Dates

Suppose we have the following data: ...
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1answer
29 views

Calculating percentage of something in a month by having its percentage per day

There is some concept that is confusing me here. In this problem: Based on statistical data in a company, communication path between two persons consumes 5% of each person’s time (during a 8-hour ...
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1answer
13 views

Calculate price of item using chance to receive item and original price

Didn't know how else to word the title, I apologize. Basically, if I were to buy a pack of cards for 500(theoretical units), and it contains 3 cards, that's 167 per card. However, is there a way to ...
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2answers
22 views

Ratio and percentage related

The ration of boys to girls in a school is 7:6. If the number of boys and girls in the school increases by 10% and 15% respectively in one year, the number of boys will exceed the number of girls by ...
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vote
1answer
64 views

What percentage do I need to pass my exam?

I have to get 60% to pass my course. It is split between gradings of: 10% for participation; 30% for essay; 60% for exam. I have so far recieved 50/100 for my participation - so 50% 30/100 for my ...
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1answer
7 views

Percentage ( Broker)

The income of a broker remains unchanged though the rate of commission is increased from 4% to 5%. What is the percentage of slump in business? Doubts: Rate of commission is extra amount on income? ...
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1answer
10 views

Percentage ( Debts & Assets )

A debtor can pay 87 paise in the rupee, but if his creditors would take 20% of his debts, he could pay them and have Rs. 42 left. Calculate his debts and assets. I don't understand the bold part ...
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0answers
22 views

How to make percentage differences end up the same? So larger number changes are even with smaller number changes

How to make percentage differences end up the same? So larger number changes are even with smaller number changes...examples: (a) New Price: 126.953 Old Price: 126.83 Difference = 0.123 / 0.09% (b) ...
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3answers
18 views

Find the original value without VAT

How to find out the amount without VAT? $$£\,3.325 + 20\,\% = £\,3.99$$ but, if I do $£3.99 - 20\% = £3.192$ instead of $£3.325$, how can I find out $£3.325$ out of $£3.99$?
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2answers
30 views

Percentage Word Problem

The chef has 25 pounds of strip loin. The trim loss on the strip loin is 35% and the cooking loss is 80% of the trimmed weight. How many pounds of trimmed, cooked strip loin will the chef have left ...
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1answer
20 views

Figure out attendance needed for remaining days to reach attendance goal

Trying to come up with attendance percentage needed to reach a goal. To simplify a student to date has gone to school 140 of the 150 days and therefore their current attendance is .93 There are 70 ...
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1answer
40 views

probability about animals being moved

I have this scenario: 1 animal with 30% probability of be moved to Japan. 1 animal with 30% probability of be moved to Japan. 1 animal with 30% probability of be moved to Japan. 1 animal ...
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1answer
22 views

Know increased percentage

I have to percentages 15%and 85%in total 100%: When I want to change the ...
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0answers
15 views

Statistical uncertainty on a percentages inferred from an A/B test

Question: What is the statistical uncertainty on percentages inferred from an A/B test? Example: $N = 100$ people are presented with an A/B choice (e.g., jumping into shark-infested water, choosing ...
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0answers
17 views

How to figure out top percentage

I am playing a video game where I have to contribute stuff with everyone else. There are tiers for progression. The tiers are top 5% top 15% top 40% and top 70%. Example top 5% gets x money. My ...
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1answer
14 views

Equivalent Interest Rates

Suppose that the APR on a certain product $x$ whose dollar value is $x_1$ is 5%. Now suppose we subtract some amount $x_2$ from $x_1$ where $x_2 < x_1$. Call this new amount $y$. How does one ...
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1answer
47 views

Contribution to change in year over year growth number

I am trying to figure out a solution to a unique problem. I am trying to calculate the contribution to year over year change (over quarters) in the sales of a shop, highlighting the contribution of 3 ...
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3answers
35 views

problem involving percentage [closed]

If 95% of the students are present and number of absent students are 25.how many total number of studrnts are there?
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0answers
17 views

Percentage share question?

Three Business partners share a business in the following percentages. Person 1 = $40$% Person 2 = $30$% Person 3 = $30$% Then p1 and p2 agreed to became $50-50$ on the business by purchasing the ...
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3answers
19 views

A store is offering a 20% discount on a certain item. The store’s sale of the item is subject to a 6% sales tax.

Quantity A : The item’s purchase price, if the discount is applied to the after-tax price Quantity B : The item’s purchase price, if the tax is applied to the discounted price Which of the ...
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1answer
23 views

Calculate Effective rate of the loan

Example: 10,000 EUR Interest Rate is: 6.96%, Additional payment 0.05% of the loan amount, and the effective loan rate is 7.34% says bank. My question is, how did they come to 7.34% as the effective ...
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3answers
41 views

How much is 6% a year in months?

I am currently in high school where we are learning about present value. I struggle with task like these: Say you get 6% interest each year, how much interest would that be each month?
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0answers
15 views

Is there a difference between discount and VAT calculations?

When I remove VAT I divide by 1.x e.g. VAT @ 20% £1 /1.2 =£0.83 But if want to remove a % discount do I use the same method as above, or the method below? 20% £1 * 20/100 = £0.20 £1 - £0.20 = ...
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1answer
25 views

What does this quantity measure?

Consider this list of numbers: $$\begin{bmatrix} 59 \\ 148 & 0.60 \\ 200 & 0.26 & 1 \\ 250 & 0.20 & 1.25 \\ 290 & 0.14 & 1.45 \\ 325 & 0.11 & 1.625 \\ 360 & ...
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1answer
24 views

10% fraud, while purchasing and selling. Whats the overall profit?

Ok, so the answer i find logical is $21$%. Like : 100 bucks paid, 110 items got. (10% profit). Then, 110 items you sell at 10% profit, you get 121 items worth of bucks. So, 100 bucks investment, 121 ...
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2answers
46 views

Number of boys in school

We have $400$ students in a school. Every $20^{th}$ student failed at the end of the school year. Which was $2\%$ of schools girls and $10\%$ of schools boys. The number of all boys attending the ...
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1answer
26 views

What is the difference between faster by factor and faster by percent?

I don't understand the difference between faster by factor versus faster by percent. For example, ...
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1answer
35 views

A number $X$ is increased by $20\%$ to form a new number $Y$. $Y$ is then decreased by $20\%$ to form a third number $Z$. Express $Z$ in terms of $X$?

A number $X$, is increased by $20\%$ to form a new number $Y$. $Y$ is then decreased by $20\%$ to form a third number $Z$. Express $Z$ in terms of $X$?
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1answer
23 views

Does using the syntax X%% make sense?

I know percentages can be multiplied, as they're basically just fractions, so it makes sense to ask what 50% of 72% of 10 is, for example. But would anybody use an expression like 3%% as shorthand for ...
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2answers
33 views

Calculate the cost of the pen to the nearest cent

A merchant sold a pen for $\$6.90$, thereby making a profit of $15\%$ on her cost calculate the cost of the pen to the merchant to the nearest cent. So I know the merchant made a $15\%$ profit on ...
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1answer
51 views

Working out percentages for payment table

I'm here because my mathematics skills are lacking somewhat for a problem i'm trying to solve.. I'm trying to work out a formula for prize distribution for the top 3rd of entrants in a competition. ...
3
votes
1answer
67 views

how to calculate what I need for final exam

Evaluation: A final mark out of 100 will be calculated as follows: Clicker Questions: 5% WeBWorK Assignments: 10% Midterm Tests (25% of the higher mark + 10% of the lower): 35% Test 1 – Saturday, ...
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1answer
26 views

Given a Percentage, Find the Smallest Integer Dividend for an Unknown Number of Integer Tests

In a classroom exam where each question is worth 1 point and the number of exam questions are unknown. If the student receives results of a test in a percentage with decimals, let's say ...
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0answers
30 views

Percent question - Very tricky - Finding total x using percentage

In a group of kangaroos, the two lightest kangoroos weigh 20% of the total weight of the group. The three heaviest kangaroos weigh 60% of the total weight. How many kangaroos are there in the group? ...
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1answer
20 views

What is the percentage?

From all the population interviewed 36% respondents had a car at home, 19% had a motorcycle and 4% had both. I need to find the percentage of respondents having a vehicle either motorcycle or car or ...
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vote
1answer
23 views

Find the probability that at least one of poker opponents hits a card

In Texas hold'em, when you see the flop there is about 33% chance that one of your 2 cards hits something on the flop, maybe not exactly but let's say it's 33% that your opponent did hit something on ...
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2answers
40 views

A man spends 80% of his income. If his income is increased by 40% and expenditure is increased by 10%, by what percentage is savings increased?

Actual Answer is $160\%$. What I have done: I took his income as $100$. According to the question, his income is increased by $40$ so, $140$. According to the question, his expenditure is $80$, ...
0
votes
1answer
17 views

Multiplying a number with percentage to get a determined sum

What percentage do we have to multiply with 125 dollars to get 355 dollars? 125(100/x) = 355 12500/x= 355 12500 = 355*x x = 12500/355 = 35,211… 125 dollars * 1,35 = 168.75 dollars (wrong) 125 ...
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2answers
20 views

Percentage of a number

How can we find out what percentage 2 gigabytes is of 15 gigabytes? I am not calculating correctly: 2 gb * x (percentage) = 15 gb x = 15/2
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1answer
21 views

How to calculate how many to add so added number is % of new total

I am trying to calculate how many shares to issue to a new shareholder so that they will have a specified percentage after the new shares are issued. I'm not sure if I have explained this clearly so ...
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1answer
41 views

How much Gold can I buy with my Salary after a Percentage Change? [closed]

I could buy 24 sovereigns of gold with my one month salary in 2014. This year the price of gold have gone up by 20%. To buy 16 sovereigns of gold how many months salary is needed now.? Answer is 4 ...
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0answers
18 views

Multiple Items Probability

Right, I have programmed a system that selects items and decides which ones to drop depending on how likely it is to be selected. I have 10 items, each with a 10% chance, however only 5 items can ...
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0answers
27 views

Percent variance - negative and positive numbers

I need to calculate the percent variance between a negative and positive number and am not sure how to do it. The numbers are $-45000000$ and $8500000$. Normally when I look at percent variance I ...