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# Keats Library purchases a number of new books, all in the ca

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Intern
Joined: 06 Apr 2017
Posts: 29
Location: United States (OR)
Schools: Haas EWMBA '21
GMAT 1: 730 Q48 V44
GMAT 2: 730 Q49 V40
GPA: 3.98
WE: Corporate Finance (Health Care)
Re: Keats Library purchases a number of new books, all in the ca [#permalink]

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30 Aug 2017, 14:16
Because the question is asking for the percent increase not the percent of the original number.

Percent increase is given by:

$$\frac{new-old}{old}\rightarrow\frac{new}{old}-1$$

Percent difference from the original value is given by:

$$\frac{new}{old}$$
Re: Keats Library purchases a number of new books, all in the ca   [#permalink] 30 Aug 2017, 14:16
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