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01 Apr 2018, 10:57
00:00

Difficulty:

15% (low)

Question Stats:

100% (01:00) correct 0% (00:00) wrong based on 24 sessions

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An online bookstore reported total sales of $768 million for the first quarter of the current year. If the total sales for the first quarter of the previous year was$640 million, what is the percent increase in total sales?

(A) 5%
(B) 15%
(C) 17%
(D) 20%
(E) 80%

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An online bookstore reported total sales of $768 million for the first [#permalink] ### Show Tags 01 Apr 2018, 13:01 Bunuel wrote: An online bookstore reported total sales of$768 million for the first quarter of the current year. If the total sales for the first quarter of the previous year was $640 million, what is the percent increase in total sales? (A) 5% (B) 15% (C) 17% (D) 20% (E) 80% The increase in the sales(reported) of the online bookstore is$768 * $$10^6$$ - $640 * $$10^6$$ =$128 * $$10^6$$

Therefore, the percent increase in total sales is $$\frac{128 * 10^6}{640 * 10^6} * 100 = 128 * \frac{10}{64} = 20$$% (Option D)
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### Show Tags

01 Apr 2018, 15:33
New Sales = 768 M
Old sales - 640 M

640 M = 100% , so 10% = 64 M

New - Old = 768-640 = 128 , which is nothing but 2 times 10% of old sale. The answer is 20%.

Ans: D
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