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

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MathRevolution
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John is collecting coins. If the amount he collected last year was 80% [#permalink] New post   23 Dec 2016, 02:32
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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?

A. 10%
B. 15%
C. 20%
D. 25%
E. 30%
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D
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MathRevolution
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Re: John is collecting coins. If the amount he collected last year was 80% [#permalink] New post   25 Dec 2016, 18:42
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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] New post   22 Apr 2017, 01:01
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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] New post   15 Nov 2017, 10:54
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% [#permalink] New post   09 Aug 2019, 05:55
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?

A. 10%
B. 15%
C. 20%
D. 25%
E. 30%


last year coins collected=80%
let this year coins collection be 100%

percent change= This year-Last year coin collections/Last year coin collection*100.
20/80*100=25% Ans (D)
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Re: John is collecting coins. If the amount he collected last year was 80% [#permalink]
09 Aug 2019, 05:55
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