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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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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2answers
16 views

A shopkeeper gives rebate a% and b% successively to buyers.Then what's the total rebate buyers should get? [on hold]

(please help me with some kind of explanation) i'm trying to learn maths, Any help will be welcomed
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16 views

Percentages as a combination of simple percentages [on hold]

What is 'a combination of simple percentages' the first question is 21% Thanks, George Barlow
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1answer
20 views

If I want to know what number plus 10% = 5.97, what is the equation? [on hold]

The answer is 5.43, but I'm having a brain fog on how to get there math-wise.
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1answer
13 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
37 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
32 views

problem involving percentage [on hold]

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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15 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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1answer
27 views

Odds of this happening [closed]

The Edmonton Oilers have won the draft lottery 4 times in the last 6 years. These are their chances of winning each year. 48.1%, 48.1%, 18.8%, 4.7%, 14.2% and 11.5%. What is the percentage that ...
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3answers
18 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 ...
0
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1answer
16 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
38 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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12 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
102 views

How many questions can I get wrong? [closed]

If an exam has $125$ questions, and the pass rate is $75\%$, how many questions can I get wrong?
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1answer
15 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
44 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
24 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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27 views

Percentage of ingredients

I'm trying to make a base soil mix for my garden this year..the recipe is as follows;25% earth worm castings, 25% mushroom compost, 20% dioatemecous earth, 10% coir, 10% peat moss, 5% topsoil and 5% ...
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1answer
33 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
50 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. ...
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1answer
46 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
23 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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24 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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1answer
22 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
31 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 $80$, ...
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1answer
16 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
37 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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14 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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21 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 ...
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1answer
28 views

Calculating percentages

I'm a total noob and need help with this, I don't understand it at all. I need to find out the percentage change using the 2 numbers for each question, some have increased some have decreased. ...
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18 views

Percentage Change in Quantity

Suppose on 1/1/2015, there are 30 apples. On 1/31/2015, there are 67 apples. Why is the percentage change over the 29 day period equal to $$ \left(\frac{67}{30} \right)^{365/29}-1$$ Couldn't you do ...
2
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2answers
28 views

Simple SAT question concerning percents

Here is a simple question I am struggling with: Allison, Jonathan, and Jennifer are teachers at a school. There classes contain a total of 82 students. Jonathan's class is 25% larger than ...
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2answers
22 views

Equation for amount of “today's money” spent in a mortgage with inflation taken in consideration

I'm having problem coming up with a way to express the recursive(compound?) nature of the inflation. Monthly the payment \$38.19 is decreasing in "today's month" value but just how much its decreasing ...
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2answers
33 views

How to find profit in Percentage? [closed]

A man buys 3 kg of wheat at 6/kg and 6 kg of wheat at 3/kg. He sells the mixture at 5/kg.what is his profit in percentage?
3
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1answer
36 views

Percentage question, can't figure it out

The mathlete team is exactly 37.5% female. If the number of boys remains unchanged what is the smallest number of girls that can leave the team to lower the percentage of girls to exactly 20%. How ...
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1answer
13 views

How to count proportional distribution of given numbers?

I am trying to figure out how to count proportional distribution of given numbers - for example: Number A: 5 Number B: 5 Number C: 5 In this case it means that ...
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1answer
21 views

Differences between two models

Vladimir bought a car for $250000$ USD. He has two models to describe the car's loss of value. Model 1: $y=250000-25000x$. Model 2: $y=250000 \cdot 0.8^x$ where $y$ is the cost and $x$ is the ...
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1answer
35 views

What is the fastest algorithm to calculate percentage change between two doubles

I would like to know what is the best solution to find the percentage change of a double compared to another one. For example, i have a variable called 'current', i want to compare it to a variable ...
2
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2answers
19 views

A question about percentages of acid solution being added to more acid solutions.

how many liters of an 80% acid solution must be mixed with a 15% acid solution to get 390L of a 70% acid solution? I'm taking a math prep class in college and I never learned this stuff in high ...
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2answers
12 views

Repeated percentage calculating question

"In a town, 75% of the workers drive a car to work. During an environment-week, only 20% of the workers drove their cars to work. How large percentage of the workers that normally drive the car left ...
3
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1answer
26 views

What is part / whole?

For example, $$\frac{\text{part}}{\text{whole}} \cdot 100 = \text{percentage}$$ Example $$\frac{1}{4} \cdot 100 \%$$ What is the quantity $\frac{\text{part}}{\text{whole}}$ called? From the above ...
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15 views

Problem Calculating Day-to-Day (Relative) Percentage Changes

I apologize if there are answers to my question elsewhere on SE. I honestly don't know what keywords to look for (as you can probably tell from my title). Here's my problem: For store purchases on ...
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58 views

cpuboss rating calculations

I was using cpuboss earlier today and noticed they converted all the benchmark scores from numbers into a score out of 10. IE/ 8.1, 6.7 etc. Being the OCD person I am. I started to try to figure out ...
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1answer
25 views

Percentage expensive or cheaper

I have some prices / costs. I have an unknown value like 520. I have a top value that can be 520 or higher. I have a bottom value that can be 520 or lower. Lets say the top value us 750 and I want ...