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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11 views

Calculate gross salary [on hold]

Kapil’s basic salary is given, let's say 40000. His DA is 40% of basic salary, and HRA is 20% of basic salary. Calculate his gross salary. Kindly provide solution with formula
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2answers
21 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?
0
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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 ...
0
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1answer
44 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, ...
0
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1answer
13 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 ...
0
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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 ...
0
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1answer
25 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 ...
0
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1answer
20 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
29 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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2answers
31 views

Probability question with a twist. [closed]

If after 50 trials there is a 8% chance of a certain event occurring. What is the chance of the event occurring if you were to only do 1 trial?
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1answer
10 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: ...
4
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4answers
404 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 ...
1
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0answers
56 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 ...
3
votes
6answers
945 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 ...
0
votes
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?
2
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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 ...
0
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0answers
6 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 ...
1
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3answers
32 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 ...
61
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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 ...
0
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1answer
29 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
30 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
votes
3answers
39 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
17 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
41 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
45 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
84 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 ...
0
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4answers
47 views

percentages problems [closed]

A maths exam contained only two questions. Problem one was solved by 70% of the pupils. Problem two was solved by 60% of them. Every pupil solved at least one of the problems. Nine pupils solved both ...
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0answers
36 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 ...
0
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1answer
17 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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0answers
22 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 ...
0
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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 ...
0
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1answer
47 views

Calculating Percentages/Probabilities of a Specific Scenario.

I've been trying for a few hours now to wrap my brain around, what at first, seemed like a simple concept. I've tried so many different things and ways of constructing scenarios so I can figure out ...
0
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0answers
31 views

Combining percentages?

i am trying to solve a certain problem, hopefully i can explain it well enough.....i am looking for a formula. (using excel) i have 3 scenarios, i need a formula that satisfies all 3 scenarios. ...
0
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1answer
12 views

finding the overall loss or profit percentage

A person sells two shirts for 880 each . he gets a 10% profit on one whereas 20% loss on the other. Find the overall profit or loss percentage I didn't understand how to find the ...
2
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1answer
17 views

How much faster will a task be in percentage terms?

This isn't necessarily a difficult question, but it's something I'm trying to set straight. The task I have in mind is mowing my lawn. Let's say I have a 16" lawnmower. I decide I'd rather have a ...
2
votes
5answers
221 views

Help With SAT Maths Problem (Percentages and Numbers)

I usually solve SAT questions easily and fast, but this one got me thinking for several minutes and I cannot seem to find an answer. Here it is: In 1995, Diana read $10$ English and $7$ French ...
3
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5answers
2k views

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 ...
2
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0answers
17 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 ...
2
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1answer
86 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 ...
0
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1answer
25 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 ...
5
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3answers
63 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: ...
0
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1answer
46 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 ...
0
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0answers
20 views

Percentage Increase and Dates

Suppose we have the following data: ...
0
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1answer
30 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 ...
0
votes
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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votes
2answers
31 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 ...
1
vote
1answer
145 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 ...
0
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1answer
23 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
45 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) ...