selling 10 oranges

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Tue Jan 12, 2010 5:31 am

By selling 10 oranges a vendor gains the selling price of two oranges. What is his gain percent?
(A) 20
(B) 22 Â½
(C) 25
(D) 27 Â½
(E) 30

The mind is everything. What you think you become. -Lord Buddha

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The Princeton Review - Manya Abroad
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Source: Beat The GMAT — Problem Solving | Tue Jan 12, 2010 5:31 am

truplayer256: Master | Next Rank: 500 Posts; Posts: 392; Joined: Thu Jan 15, 2009 12:52 pm; Location: New Jersey; Thanked: 76 times

by truplayer256 » Tue Jan 12, 2010 5:34 am

Oranges sell for x dollars each and are bought for y dollars each.

10x-10y=2x

x-y=x/5

y=4x/5

10x-8x/(8x)*100=25%

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