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.
Questions tagged [percentages]
1440 questions
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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 final year grade?
The calculation I think for $20\%$…
Michael
- 27
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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 essay - 30%
and am yet to sit my exam.
What do I need…
user238334
- 11
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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 share of p3.
the business was valued at…
maxy
- 11
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3 answers
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 $80$, then his expenditure increased by $10\%$ so…
Joseph Philipson
- 111
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2 answers
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
Math is fun
- 119
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0 answers
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 would do the following,…
user221940
- 11
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1 answer
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 amount of years that have passed since the purchase.…
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2 answers
General formula - % of %
I would like to find a way to represent the following idea in a general formula:
I have 100%, then I subtract 2% from it. Now I have 98% of the original value and subtract 4% from it, which leaves me with 94.08%.
Basically, it is something…
Th3B0Y
- 111
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1 answer
Quick way to express percent from negative interval
I have some data which looks like this:
I get a number in the -6/+4 range and I need to express it with percent.
If I get 4 of course the result is 100%, If I get -6 is 0%, etc.
Is there a quick formula I can use to obtain the percent value of, say,…
JessyP
- 13
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1 answer
Percentages and Concentrations
What is the concentration of a sugar solution made by mixing 1 kilogram of 12% sugar solution with 2 kilograms of water.
Sorry about the title, I'm not sure what to call this.
I'm really not sure where to start. So 12/100 + 200%?
12/300 = 6/150 =…
John
- 159
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5 answers
Proportions with Percentages
How would I solve this using a proportion?
What is $2$% of $\frac{1}{2}$?
I tried doing $\frac{2}{100} = \frac{x}{50}$, but I'm not sure if its right.
John
- 159
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2 answers
10% of ten English pounds £
I, unfortunately, have serious dyscalculia and struggle with maths. This makes figuring out simple everyday maths quite difficult. I'd really appreciate the help with this. Thanks in advance.
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Percentage increase of two percentages
Can anyone help me with this problem? What is the percentage increase from 27.7% to 28.2%? I came up with 1.8% but my brother keeps telling me it's 18%
Timmy
- 11
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2 answers
Profit and loss problem
A shopkeeper allows a discount of 12.5% on the marked price of a certain article and makes a profit of 20%. If the article costs the shopkeeper Rs 210, then the marked price of the article will be?
Vikash
- 47
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Why the answer is not negative here?
If one number is $80\%$ of the other and $4$ times the sum of their squares is $656$, then What are the numbers?
My answer is -
let the two numbers be x and y.
$x = \frac 45 y$
$4(x^2 + y^2) = 656$
$\implies x^2 + y^2 = 164$
Now substitute $x…
dexterous
- 621