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# The percent change from 29 to 43 is approximately what...?

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Current Student
Joined: 18 Jul 2015
Posts: 39
Location: Brazil
Concentration: General Management, Strategy
GMAT 1: 640 Q39 V38
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The percent change from 29 to 43 is approximately what...?  [#permalink]

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27 Feb 2016, 05:07
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Difficulty:

65% (hard)

Question Stats:

53% (01:45) correct 47% (02:04) wrong based on 117 sessions

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The percent change from 29 to 43 is approximately what percent of the percent change from 43 to 57?

(A) 50%
(B) 66%
(C) 110%
(D) 133%
(E) 150%

Please explain the fastest way to think throw this problem. I know that this type of question can give you some extra time on harder problems during the test.
Please give your opinion about the difficult level of the question.
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Joined: 20 Mar 2014
Posts: 2624
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44
GPA: 3.7
WE: Engineering (Aerospace and Defense)
The percent change from 29 to 43 is approximately what...?  [#permalink]

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27 Feb 2016, 05:47
1
fabricioka wrote:
The percent change from 29 to 43 is approximately what percent of the percent change from 43 to 57?

(A) 50%
(B) 66%
(C) 110%
(D) 133%
(E) 150%

Please explain the fastest way to think throw this problem. I know that this type of question can give you some extra time on harder problems during the test.
Please give your opinion about the difficult level of the question.

This question should be a 600-700 level just because of the care you have to take in order to arrive at the correct solution.

$$%age change = \frac{(final value - initial value)*100}{initial value}$$

Thus, %age change from 29 to 43 = 14/29 $$\approx$$ 50% or 0.5 (we can approximate in this question as the options given are far apart).

%age change from 43 to 57 = 14/43 $$\approx$$0.33

Thus, the required value = 50/33 = 1+17/33 $$\approx$$ 1+0.5 = 1.5 or 150%

E is thus the correct answer.

Hope this helps.
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The percent change from 29 to 43 is approximately what...?  [#permalink]

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29 Feb 2016, 01:53
1
You can set an equation like this,

$$\frac{(43 - 29)}{29} = \frac{x}{100}\frac{(57-43)}{43}$$

$$\frac{14}{29} =\frac{x}{100} \frac{14}{43}$$

Divide both side by 14, and multiply both side by 43x100, you get

$$x = \frac{(43)(100)}{29}$$

x is approximately $$\frac{(45)(100)}{30}$$ which is $$150$$
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Joined: 02 Aug 2009
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Re: The percent change from 29 to 43 is approximately what...?  [#permalink]

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29 Feb 2016, 04:29
fabricioka wrote:
The percent change from 29 to 43 is approximately what percent of the percent change from 43 to 57?

(A) 50%
(B) 66%
(C) 110%
(D) 133%
(E) 150%

Please explain the fastest way to think throw this problem. I know that this type of question can give you some extra time on harder problems during the test.
Please give your opinion about the difficult level of the question.

Hi,
the change is 14 in both cases, so it boils down to bases..
(14/29)/(14/43)=43/29= nearly 7*6/7*4= 6/4, %=100*3/2 which is 150%

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Concentration: Finance, Marketing
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The percent change from 29 to 43 is approximately what...?  [#permalink]

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17 Jul 2017, 09:10
Lesson learnt: Always approximate the value to the hundredth decimal. I stopped long division of 43/29 [I setup the equation the same way as Aves above did] to the tenth decimal and arrived at 1.4 and I thought 1.4 was closer to 133% than it was to 150% (although technically, it is mid-point) . Little did I know that quotient is actually 1.48. Yeap...mistake.
The percent change from 29 to 43 is approximately what...?   [#permalink] 17 Jul 2017, 09:10
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# The percent change from 29 to 43 is approximately what...?

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