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10 Oct 2016, 08:08
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The price of a gallon of gasoline was $30 on the 15th of March. By the 15th of April, the price per gallon had increased by 20%, and by the 15th of May the price had increased again to a total of$45 per gallon. What was the percent change in the price of a gallon of gasoline between the 15th of April and the 15th of May?

A. 20%
B. 25%
C. 30%
D. 35%
E. 50%

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10 Oct 2016, 11:01
B it is.
date price
15 mar $30 15 Apr$36 since 20% of 30 is 6
15 May $45 so change from 15th May to 15 Apr = 45-36 = 9 %age change = (9/36)*100 = 25% Hence B Senior Manager Joined: 24 Nov 2015 Posts: 496 Location: United States (LA) Re: The price of a gallon of gasoline was$30 on the 15th of March. By the  [#permalink]

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14 Oct 2016, 03:08
Price of a gallon of gasoline was $30 on the 15th of March Price of a gallon of gasoline increased by 20 %so the price on 15th of April = 1.2*30 =$36
Price of a gallon of gasoline was $45 on 15th of May so there was a increase of$9 from 15th of april to 15 th of may
% increase = $$\frac{9}{36}$$ * 100 = 25 %

+1 kudos if you like the solution
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Re: The price of a gallon of gasoline was $30 on the 15th of March. By the [#permalink] ### Show Tags 14 Oct 2016, 05:49 Price in March - 30$
As price increased by 20% from March to April, price in April = 1.2*30(36)
Since we need to find out how much percent it increased by in may
assume x to be percentage of growth in May from April
x% of 36 is 45
x is 25%(Option B)
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Re: The price of a gallon of gasoline was $30 on the 15th of March. By the [#permalink] ### Show Tags 21 Jun 2017, 03:24 Bunuel wrote: The price of a gallon of gasoline was$30 on the 15th of March. By the 15th of April, the price per gallon had increased by 20%, and by the 15th of May the price had increased again to a total of $45 per gallon. What was the percent change in the price of a gallon of gasoline between the 15th of April and the 15th of May? A. 20% B. 25% C. 30% D. 35% E. 50% We can solve this problem rather quickly by applying a few fundamental formulas Step 1$30(1.20) = $36.00 remember any increase under 100% percent can be expressed as (1 +r) where r is the rate of increase so here we have (1 +.20) or even ( 1 +20/100) Step 2 New- Old/ Old = percentage increase$45-$36/$36= 1/4 = .25 x 100 = 25 percent increase

Thus
"B"
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Re: The price of a gallon of gasoline was $30 on the 15th of March. By the [#permalink] ### Show Tags 14 Jul 2018, 11:53 Bunuel wrote: The price of a gallon of gasoline was$30 on the 15th of March. By the 15th of April, the price per gallon had increased by 20%, and by the 15th of May the price had increased again to a total of $45 per gallon. What was the percent change in the price of a gallon of gasoline between the 15th of April and the 15th of May? A. 20% B. 25% C. 30% D. 35% E. 50% 45/(1.2*30)=1.25=25% B Re: The price of a gallon of gasoline was$30 on the 15th of March. By the   [#permalink] 14 Jul 2018, 11:53
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