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ruplun: Master | Next Rank: 500 Posts; Posts: 232; Joined: Fri Jun 18, 2010 7:09 amFollowed by: 2 members; Thanked: 1 times

by ruplun » Tue Jul 19, 2011 6:54 am

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Source: Beat The GMAT — Problem Solving | Tue Jul 19, 2011 6:54 am

GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Tue Jul 19, 2011 7:19 am

I posted a solution here:

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knight247: Legendary Member; Posts: 504; Joined: Tue Apr 19, 2011 1:40 pmFollowed by: 11 members; Thanked: 114 times

by knight247 » Wed Jul 20, 2011 2:50 am

In May
Lee family's earnings=x
Mrs. Lee's earnings=60x/100= 0.6x

In June
Lee family's earnings=x
Mrs. Lee's earnings= 0.6x+20(0.6x)/100=0.6x+12x/100=0.6x+0.12x=0.62X

For June,
Mrs. Lee's earnings*100/Lee family's earnings=0.62x*100/x=62% â‰ˆ64% So A

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