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 do I determine the remaining ratio in this equation?

I'm developing an experience system for a game, where the experience is gained per hit. Anyways, I need to calculate how much EXP a user should get each time they hit a monster. So for example if a ...
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19 views

What is David's Salary per month?

John and David's salary adds upto 10,000 $ per month. They spend the same amount monthly and then it is found that ratio of their savings in 6:!. Which of the following is John's salary 6000 , 5000 , ...
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13 views

To find days in which order will be completed

A company asks for production of $x$ number of goods. The company produces $y$ number of goods, daily out of which z% are unfit for sale. To find in how many days will the order will be completed ? ...
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2answers
18 views

Difference between the two ways of finding average winning rate over a period of time

Ok I might be asking something stupid, please bear with me, math is not my strong suit. This has to be a duplicate but I dont know how to search them. I dont even know how to word the title, kindly ...
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2answers
14 views

Finding how much percent passed in both Maths and English

In an examination, 35% of the candidates failed in Mathematics and 25% in English. If 10% failed in both Math and English. Then how many percent passed in both the subjects ? ATTEMPT Let x be total ...
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13 views

Finding quantity of mixture

In a mixture of milk and water, there is only $26$% water. After replacing the mixture with $7$ litres of pure milk, the percentage of milk in the mixture become $76$%. The quantity of mixture is ...
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1answer
18 views

Finding original price of Tea per kg

A reduction of $ 2 per kg enables a man to purchase 2 kg more tea for $8. Find original price of tea per kg Attempt Let price be $x per kg of tea .So let man buys 10 kg of tea .So total cost is ...
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3answers
29 views

How much quantity of water should be added?

What quantity of water should be added to $16$ litres of $25%$ acidic solution to reduce it to $20%$ acidic solution ? Attempt. We have $16$ litres of solution, it has $4$ litres of acid and $12$ ...
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3answers
26 views

By how much percent sugar consumption should be reduced

If the price of sugar is increased by $7%$, then by how much per cent should a housewife reduce the consumption of sugar, to have no excess expenditure ATTEMPT Let family consume $100$ units of ...
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2answers
49 views

Dont know what 2.9% is from 8995.00 [closed]

Looking to find out what id have to pay at 2.9%. Out of 8995.00?
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2answers
21 views

Percentage difference between loaded miles and empty miles

I dispatch for a trucking company. I'm trying to find a formula to work out the percentage difference between loaded miles and empty miles. For example: One driver drives 200 miles. 150 loaded and 50 ...
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1answer
16 views

How do I calculate the amount of 3 Fluids, where 2 are a percentage of the first?

I have 3 Fluids: Base Flavor1 Flavor2 The target is to have 50 ml of overall produce, where 10% are Flavor1 and 5% are Flavor2. If I just calculate it off the 50 ml, I end up with 57.5 ml, which ...
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16 views

Keep video for certain time frames based upon percentages? (85/13/2 breakdown)

I'm trying to build an equation for an Excel spreadsheet that is used to calculate storage requirements for video retention over a given policy. Currently it works great for policies that only have ...
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1answer
19 views

Comparing percentages of a sample to that of the population.

This might be stupid question, but I'm in this sort of situation: 60% of people in a city have a pet cat, but the national rate is 50%. So, assuming we have the required bits of information about ...
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0answers
24 views

Comparing two percentages when one is negative

I am having trouble comparing two percent values to show the change in one compared to the change in another. For all stores looking at all sales: The average sales growth for week 1 this year ...
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0answers
20 views

Compounded and Simple Interest Rates

Suppose we have a loan worth 10000 that is being repaid late as a lump sum on a given day 30 days after the due date. Suppose the original interest rate is 5% so that the amount owed before late ...
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1answer
10 views

Grading limitless variables

I am trying to calculate the quality of a triangle. Parameters are skewness, aspect ratio, and size. Skewness ranges between 0 and 1. Aspect ratio is the ratio of longest edge to shortest edge. ...
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0answers
15 views

Rebasing of scores to be a more accurate reflection

I want to compare various scores with one another on a fair basis. Let's say I have 4 results: 10/20 (50%) 1/2 (50%) 1/4 (25%) 2/10 (20%) I need to assign weights of importance to the ...
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2answers
29 views

How do I add a percentage to a value then subtract it again to get the same number?

I'm doing a budget for work where I have to add $15\%$ to a price. But then my client is going to subtract $15\%$ from the total but I need to make the original price back. I.e. $$£100.00 + 15\% = ...
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26 views

Get the percentage of a certain category

I have news belonging to 4 categories like sports,movie,politics and current-affairs. Now suppose if I got my total result of news as 45 which belongs all these 4 categories ie ...
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1answer
27 views

If this is done properly does your answer come out to $40\%$ or $71.4\%$?? [closed]

A tool room $28$ feet by $35$ feet was enlarged to the dimensions of $28$ feet by $49$ feet. By what percentage did the room size increase?
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1answer
64 views

Frazzle game question

In $7^{th}$ grade, in order to learn divisibility, memory, and focus, my math teacher had my pre-algebra class play a game called Frazzle. To play the game Frazzle, each person went around the room ...
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2answers
25 views

Original price formula after discount [duplicate]

I need a short formula to calculate the original price. e.g I bought a cell of $125\$$ after a $27\%$ sale. what is the original price of the cell?
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0answers
15 views

Pay Plan Calculation

I'm trying to figure out a formula for a pay plan, I think we are calculating things incorrectly but I can't seem to work out the right formula.. The idea is that an employee is paid a percentage of ...
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1answer
51 views

Jimmy got a 38.5% (± 0.05%) on his math test. How many questions did the test have at a minimum?

The answer is not "200 questions", though it would be if he got a score of exactly 38.5%. The fact that anything that rounds to the nearest decimal is allowed complicates things. I know the answer, ...
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1answer
14 views

Turn times into percentage for pie chart

First time posting here so hope am in the right place. I have a report which is a breakdown of time spent in hours/minutes for certain projects over a monthly period. I want to show these as a pie ...
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1answer
26 views

What is the probability of an item in a list being chosen if both the list and item have different probabilities?

This is kind of a programming question, but more so a mathematical question. I have two lists that contain various items inside of the lists. Each List has a rate of being chosen, then each item in ...
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28 views

Working out percentage in reverse

Trying to brush up my appalling maths and came unstuck on this example: "If I earned $11 yesterday, and that's a 96% drop, how much do I normally earn?" I started approaching this as follows: If ...
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1answer
22 views

Percentages: Department of Meteorology

$1.$ I worked out $23 percent$ of all disasters that took place in Europe ($313$) $0.77$ x $313$ $=$ $241.01$ $2.$ I then worked out $18percent$ of European disasters that were storms ($241.01$) ...
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1answer
30 views

Percent word question

My son is stuck on this maths homework question and I do not know how to do this. The question says: "there are $682$ girls in a crowd of $1000$. What percent is this". Use no calculator. We have ...
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1answer
12 views

Dynamic weighed probability

If I have a list of objects, and want [programmatically] to randomly pull one out, I can simply choose a random number representing a valid index within the range of elements of the list: ...
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3answers
422 views

10% lower and 10% higher of 100

I'm confused about how to get the $10\%$ higher and $10\%$ lower of $100$. I'm alone I don't know if my idea is correct. My idea is $10\%$ higher of $100$ is $110$, then the $10\%$ lower of $100$ is ...
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62 views

Calculating the Area of a Circle Occupied by a Rectangle

This is a question regarding how to calculate the area of a circle occupied by a rectangle when that rectangle is larger than the circle (see this link for a example image ...
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6answers
950 views

Percentage above 100

I am stuck on helping my 9-year old on a percentage question (she has quite a few but I don't know the method of doing this). Can someone help on an explanation for this one so I can assist on the ...
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0answers
19 views

Is the percentage difference between two zero values 0 or undefined? [duplicate]

I have $0$ apples. My friend has $0$ apples. I would think that the percentage difference in the amount of apples we have is $0\%$, but is it in fact undefined because you divide by zero?
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1answer
38 views

If a 17%-efficient system becomes “10 times more efficient”, what is the absolute efficiency? Or is this not possible?

Sometimes in reading around the net, I see things like "This car could be ten times more efficient if the drivetrain and engine were replaced by batteries and electric-motor wheels." If I'm not ...
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0answers
7 views

Counting a percent of a number [ as time in minutes ]

Greetings Iam trying to create a excel calculator, that will count time needed to complete a certain case. This is quite basic match but I might be wrong in my attempt. Lets start with this. We have ...
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3answers
33 views

Trying to figure out my percentage raises at work

If I make $ 14.40 right now and max out at 24 an hour, how many seperate 2% raises will I need to get to be at the max? Is there a simple math equation to get this answer or do I have to just keep ...
62
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14answers
11k views

Express 99 2/3% as a fraction? No calculator

My 9-year-old daughter is stuck on this question and normally I can help her, but I am also stuck on this! I have looked everywhere to find out how to do this but to no avail so any help/guidance is ...
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1answer
34 views

How to find the full amount of calculated VAT amount

How to find the full amount of Calculated Vat value? Here i have calculated VAT Amount from Full amount. VAT Percentage 10% Full Amount = 100 VAT Amount = ??? = (10/100) = 0.1 = 0.1 * 100 = 10 ...
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1answer
41 views

Maths quantitative aptitude question on percentages [closed]

The hourly wages of a female labour are increased by 12.5%, whereas the weekly working hours are reduced by 8%. Find the percentage change in the weekly wages if she was getting Rs. 1200 per week for ...
3
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3answers
40 views

Tax difference on dollar amounts? [duplicate]

Why is it that on all my calculators, when I subtract 12% from $56$, I get $49.28$, but when I add 12% to $50$, I get $56$?
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1answer
23 views

Calculating Monthly Rate of Interest for Home Loan given EMI, Interest and Principal Amount

I have taken a loan with below details: Loan Start Date: 6th July 2012 EMI Date: 5th Day of Every Month (Initially 21000 and later 22000 per month) Tenure: 20 Years (This decreases based on the ...
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2answers
42 views

Grade needed to pass 60%

If I have 4 quarters and I need a 60% to pass the school year what equation can I use to find what I need to pass? Example. 1st marking period: 87.20% 2nd marking period 69.15% 3rd marking period: ...
3
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2answers
48 views

Percentage change relationship

Given $Z=X^{\alpha}$ how can one prove that the percentage change in $Z$ is simply $\alpha$ times the percentage change in $X$? This was given as a 'simple mathematical rule' in an economics text ...
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1answer
94 views

Area of Circle Overlapped by Rectangle

I'm trying to determine 'how much' (as a percentage) a 2D rectangle fills a 2D circle. Actual Application: I was comparing the accuracy of some computer game weapons by calculating the max possible ...
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1answer
47 views

How do I calculate the adjusted percentage of dice out comes.

What I’m attempting to do is construct a spreadsheet to calculate the number of wounds and kills for a tabletop board game I play. To give everyone an idea of the situation. You have figure A shoots ...
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1answer
20 views

Algorithm for finding fee coverage total

Is there a mathematical concept involving prediction of a resulting value from a set equation? Here is the situation. A payment processor charges 2.9% + $.30 per credit card transaction. A ...
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26 views

Calculating likelihood using percentages from two different samples.

I'm studying unemployment rates in different sections of a community using census data so the sample size is large and representative. If unemployment is 12% for ethnic minorities and 9% for others ...
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1answer
17 views

Create X/Y percentage formula based on two example values

I'm trying to figure out the formula of X to Y based on the following two examples: If $X = 78.6$ then $Y = 3.8 \%$ If $X = 72.9$ then $Y = 4.3\%$ As X decreases Y raises. I'd like to be able to ...