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The price of a gallon of gasoline was $30 on the 15th of March. By the

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The price of a gallon of gasoline was $30 on the 15th of March. By the  [#permalink]

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New post 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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Re: The price of a gallon of gasoline was $30 on the 15th of March. By the  [#permalink]

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New post 10 Oct 2016, 08:19
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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%


Price of Gasoline on 15th March = 30
Price of Gasoline on 15th April is (30*120/100) =36
Price of Gasoline on 15th May = 45

Quote:
What was the percent change in the price of a gallon of gasoline between the 15th of April and the 15th of May?


Percentage change is \(\frac{(45 - 36)}{36}*100\) = 25%

Hence correct answer will be (B) 25%

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Re: The price of a gallon of gasoline was $30 on the 15th of March. By the  [#permalink]

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New post 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
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Re: The price of a gallon of gasoline was $30 on the 15th of March. By the  [#permalink]

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New post 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 %

Correct answer - B




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Re: The price of a gallon of gasoline was $30 on the 15th of March. By the  [#permalink]

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New post 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]

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New post 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]

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New post 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
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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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