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By what percent was the price of a certain candy bar increased?

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By what percent was the price of a certain candy bar increased? [#permalink]
Bunuel
By what percent was the price of a certain candy bar increased?

(1) The price of the candy bar was increased by 5 cents.
(2) The price of the candy bar after the increase was 45 cents.

% increase = Increase/Old price

Statement 1: Increase = 5 --------------- NOT SUFFICIENT (since we do not know the old price)

Statement 2: New price = Old price + Increase = 45 -------------- NOT SUFFICIENT (since we do not know the old price and increase in price)

1 & 2 together,

Increase = 5
Old price = New price - Increase = 45 -5 = 40

% increase = (5/40)*100 = (1/8)*100 = 12.5%

SUFFICIENT
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Re: By what percent was the price of a certain candy bar increased? [#permalink]
OFFICIAL GMAT EXPLANATION

In (1), only the increase in price is given, and both the original and final prices are unknown. Thus, the percent increase cannot be determined from (1) alone, and the answer must be B, C, or E. In (2), only the final price is given, so the percent increase cannot be determined from (2) alone, and the answer must be C or E. From (1) and (2) together, the amount of the increase is known and the price before the increase can be computed. Therefore, the percent increase can be determined, and the best answer is C.
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Re: By what percent was the price of a certain candy bar increased? [#permalink]
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Re: By what percent was the price of a certain candy bar increased? [#permalink]
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