Before adding to her collection, Laura had 207 antique figurines stored in 9 boxes. After adding to her collection, she

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BTGmoderatorLU: Moderator; Posts: 2589; Joined: Sun Oct 15, 2017 1:50 pmFollowed by: 6 members

by BTGmoderatorLU » Sat Dec 18, 2021 6:00 pm

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Source: Princeton Review

Before adding to her collection, Laura had 207 figurines stored in 9 boxes. After adding to her collection, she had 386 figurines in 12 boxes. What was the approximate percent increase in the average number of figurines per box?

A. 9%
B. 33%
C. 40%
D. 50%
E. 86%

The OA is C

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Source: Beat The GMAT — Problem Solving | Sat Dec 18, 2021 6:00 pm

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Re: Before adding to her collection, Laura had 207 antique figurines stored in 9 boxes. After adding to her collection,

by Brent@GMATPrepNow » Sun Dec 19, 2021 7:19 am

BTGmoderatorLU wrote: ↑
Sat Dec 18, 2021 6:00 pm
Source: Princeton Review

Before adding to her collection, Laura had 207 figurines stored in 9 boxes. After adding to her collection, she had 386 figurines in 12 boxes. What was the approximate percent increase in the average number of figurines per box?

A. 9%
B. 33%
C. 40%
D. 50%
E. 86%

The OA is C

Please note that the word approximate typically tells us that we can use some estimation during the solution

INITIAL SITUATION
207/9 = 23 figurines per box

AFTER ADDING TO COLLECTION
386/12 ≈ 32 figurines per box

Percent increase = (100)(new - old)/old
≈ (100)(32 - 23)/23
≈ (100)(9)/23
≈ 900/23
≈ 39

Answer: C

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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