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

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Bunuel
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By what percent was the price of a certain candy bar increased? [#permalink] By what percent was the price of a certain candy bar increased?   03 Oct 2018, 00:41
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A
B
C
D
E

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92% (00:33) correct 8% (00:43) wrong based on 724 sessions
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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.
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C
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Re: By what percent was the price of a certain candy bar increased? [#permalink] By what percent was the price of a certain candy bar increased?   03 Oct 2018, 00:47
What is the percentage increase in candy bar price. We need to know the original price and the amount by which price is increased to find percent increase.

Let's look at statements.

(1) The price of the candy bar was increased by 5 cents. Not sufficient as only the increase is given.
(2) The price of the candy bar after the increase was 45 cents Not sufficient as only the final price is given but original price cannot be determined.

(1)+(2) : Sufficient as both original price and price increase can be determined and hence the percent increase

Hence Option (C) is our choice.

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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.
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Re: By what percent was the price of a certain candy bar increased? [#permalink] By what percent was the price of a certain candy bar increased?   03 Oct 2018, 01:06
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Statement 1:

Only gives info about the increase in price. So insufficient to determine the percentage price increase.

Statement 2:

After increase price became 45 cents. But how much was it increased? No info.
Insufficient.

Combining both:

45-5 = 40 Cents was the original price.

Percent Increase = 5/40 = 12.5%.

C is the answer.
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By what percent was the price of a certain candy bar increased? [#permalink] By what percent was the price of a certain candy bar increased?   17 Aug 2020, 06:59
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] By what percent was the price of a certain candy bar increased?   22 Oct 2020, 05:32
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] By what percent was the price of a certain candy bar increased?   02 Aug 2023, 17:52
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Re: By what percent was the price of a certain candy bar increased? [#permalink]
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