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albertrahul: Senior | Next Rank: 100 Posts; Posts: 83; Joined: Wed Jun 04, 2008 3:30 am; Thanked: 4 times

by albertrahul » Mon Jun 30, 2008 2:00 am

Please help me understand solution for this question.

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Source: Beat The GMAT — Problem Solving | Mon Jun 30, 2008 2:00 am

durgesh79: Master | Next Rank: 500 Posts; Posts: 167; Joined: Tue Apr 22, 2008 12:48 am; Thanked: 15 times

by durgesh79 » Mon Jun 30, 2008 2:12 am

selling price is S
S-150=0.4*S
0.6*S=150
S=250

profit = 250-150=100
Option E

albertrahul: Senior | Next Rank: 100 Posts; Posts: 83; Joined: Wed Jun 04, 2008 3:30 am; Thanked: 4 times

by albertrahul » Mon Jun 30, 2008 2:25 am

Thanks Durgesh.

How did you got second line "0.6*S=150"?

durgesh79: Master | Next Rank: 500 Posts; Posts: 167; Joined: Tue Apr 22, 2008 12:48 am; Thanked: 15 times

by durgesh79 » Mon Jun 30, 2008 5:31 am

take all terms with S to one side.
S*(1-0.4)=0.6*S

AleksandrM: Legendary Member; Posts: 566; Joined: Fri Jan 04, 2008 11:01 am; Location: Philadelphia; Thanked: 31 times; GMAT Score:640

by AleksandrM » Mon Jun 30, 2008 9:21 am

Let x be the selling price.

150 +.4x = x

150 = .6x

x = 250

250 - 150 = 100

albertrahul: Senior | Next Rank: 100 Posts; Posts: 83; Joined: Wed Jun 04, 2008 3:30 am; Thanked: 4 times

by albertrahul » Tue Jul 01, 2008 9:52 pm

Thanks Aleksandr and Durgesh!
That's actually a fairly easy question, I think I just got stuck with verbiage.

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