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John is collecting coins. If the amount he collected last year was 80%

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Math Revolution GMAT Instructor
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John is collecting coins. If the amount he collected last year was 80%  [#permalink]

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New post 23 Dec 2016, 01:32
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

91% (01:00) correct 9% (00:48) wrong based on 34 sessions

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John is collecting coins. If the amount he collected last year was 80% of the amount he collected this year, what is the percent increase of the coins that he collected from last year to this year?

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John is collecting coins. If the amount he collected last year was 80%  [#permalink]

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New post 25 Dec 2016, 17:42
You get percent increase = (after−before)/before(100). If you assume the total number of coins collected this year as 100c, the number of coins collected from last year becomes 100c(80%)=80c. In other words, if 80c -> 100c,
Percent increase = (100c−80c)/80c(100) = 20c/80c(100)=25, so you get 25%.

Therefore, the answer is D.
Answer: D
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Re: John is collecting coins. If the amount he collected last year was 80%  [#permalink]

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New post 22 Apr 2017, 00:01
MathRevolution
Please add options as well in question
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Re: John is collecting coins. If the amount he collected last year was 80%  [#permalink]

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New post 15 Nov 2017, 09:54
MathRevolution wrote:
John is collecting coins. If the amount he collected last year was 80% of the amount he collected this year, what is the percent increase of the coins that he collected from last year to this year?


MathRevolution is there any choices I can't see it. :oops:
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Re: John is collecting coins. If the amount he collected last year was 80% &nbs [#permalink] 15 Nov 2017, 09:54
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John is collecting coins. If the amount he collected last year was 80%

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