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
4
votes
7 answers
Percentage question on voting
In an election, 2 candidates participated.10% did not vote. 300 votes
were declared invalid and the winner gets 60% of voting list and wins
by 900 votes. Find no of valid votes.
Ans. 1500
What I tried:
Winner=60%;Not…
Soumee
- 1,087
4
votes
3 answers
Tax difference on dollar amounts?
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 $56$?
David Metcalfe
- 187
4
votes
3 answers
Getting percentage difference between two numbers?
For example, if someone got a raise in salary and they were getting paid 80,000 and are now getting paid 85,000 how can you work out what percentage their raise was?
Brett
- 143
3
votes
4 answers
Percent word problem - calculate store cost
Here's a word problem having to do with percentages, and the answer doesn't make sense. A furniture store is selling a desk for $300. If the store makes a 25% profit on the sale, what is the store's cost for the desk? The answer is $240 but how?…
Alex
- 259
3
votes
0 answers
Percent Increase between old and new values - kindof...
I'd like to check if a formula I have been using is wrong.
I am studying and came across the following in how to calculate the percent increase/decrease of a value:
% increase = Increase ÷ Original Number × 100
For example if I buy a product for 2…
Mucker
- 131
- 1
3
votes
8 answers
$(1+x)(1-x)=1-x^2$
If a number increases by $x\%$ and then decreases by $x\%$ it will be decreased by $\dfrac{x^2}{100}\%$ since $(1+x)(1-x)=1-x^2$. I understand that the decrease is on a value greater than the initial value. My question is why is there an asymmetry…
user5402
- 3,006
3
votes
5 answers
How to intuit that saving $1/3$ on price = gaining $50\%$ more in quantity for the original price?
I already understand, and so ask not about, the following; but I still do not comprehend the intuition behind the equality in this question's title. Intuitively: why must the % of price discount $<$ the % of the increase in quantity? Why cannot…
user53259
3
votes
4 answers
Is it correct to say that $0$ is not $100$% of $0$?
$n = 100$% of n
if $n=0$ then $0 = 100$% of $0$, but
$0 = 1$% of $0$, $0 = 2$% of $0, 0 = 3$% of $0$, etc
Is it correct to say that $0$ is not $100$% of $0$?
Maxim
- 41
3
votes
2 answers
Percentage nature
In mathematical expressions, the internationally recognized symbol % (percent) may be used with the SI to represent the number 0.01. Thus, it can be used to express the values of dimensionless quantities.
According to Le Système international…
Ali Tarek
- 61
3
votes
2 answers
Having 2 x 50% chance of something gives me what percentage chance of getting that?
I were playing Hearthstone the other day (a card game).
I got a card that gave me 50% chance to draw a extra card, when it where to be my turn.
Then i got another one of those. It made me wonder what my chances then would be to draw a extra card,…
LateChicken
- 33
3
votes
1 answer
When comparing percentages, do you subtract or divide?
This may sound like a dumb question, but I was comparing the calcium content in almond milk (45% of daily value per serving) vs. cow milk (30% per serving) and ran into this problem. It appears almond milk has 1.5 times the amount of calcium per…
5AMWE5T
- 147
3
votes
1 answer
How do we convert annual growth rate to daily growth rate?
Let's say we have an annual growth rate of $2 \%$, then $p=p_0(1.02)^Y$ where $Y$ is time in years. Would it be safe to say $p=p_0(1.02)^{D/365}$ where $D$ is the time in days (assuming a year is always $365$ days)? If so, could the daily growth…
asdfjkl
- 31
3
votes
1 answer
Basic Mathematics
Thanks for your help. I'm not too sure if this is the correct way to answer this question, but let me know!
A student is having issues with an online computing grading system.
The system is displaying his term grade, but not his actual test…
Alex
- 179
3
votes
1 answer
Calculating the percentage increase
A doctor was seeing 3 patients a day.
He then started to see 18 people a day.
What is the percentage increase? And how do I work this out?
user259036
- 39
3
votes
6 answers
Percentage above 100
I am stuck on helping my nine-year old on a percentage question. She has quite a few questions of this form, however but I don't know the method of solving them. Here is one of the questions:
Question:
Yesterday $200$ flights left Heathrow…
lara400
- 866