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Manager
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Connie paid a sales tax of 8 percent on her purchase. If the [#permalink]
 09 May 2008, 18:58
Connie paid a sales tax of 8 percent on her purchase. If the sales tax had been only 5 percent, she would have paid $12 less in sales tax on her purchase. What was the total amount that Connie paid for her purchase including sales tax?
A) $368
B) $380
C) $400
D) $420
E) $432
OA to follow.
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Director
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E
3% = $12
1% = $4
100% = $400
8% = $32
400 + 32 = 432
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Manager
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P*1.08=T1
P*1.05=T2=T1-12
combine eqns
p(.03)=12
12/.03=400
400*1.08=432
E
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Manager
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gmatnub wrote: E
3% = $12
1% = $4
100% = $400
8% = $32
400 + 32 = 432 I like this approach 
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SVP
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jimmylow wrote: gmatnub wrote: E
3% = $12
1% = $4
100% = $400
8% = $32
400 + 32 = 432 I like this approach Me too, but seem risky for me!I am not an expert, usually confused and make a silly mistake! 
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Director
Status: GMAT Learner
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RyanDe680 wrote: Connie paid a sales tax of 8 percent on her purchase. If the sales tax had been only 5 percent, she would have paid $12 less in sales tax on her purchase. What was the total amount that Connie paid for her purchase including sales tax?
A) $368
B) $380
C) $400
D) $420
E) $432
OA to follow. Connie paid x dollar before sales tax so, 1.08x - 1.05x = 12 0.03x = 12 x = 400 sales tax 400*8% = 32 Connie paid = 400+32= $432 Ans. E
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Last edited by Baten80 on 11 Dec 2011, 11:43, edited 1 time in total.
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Senior Manager
Joined: 23 Mar 2011
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Hi Baten, I did your way. But I only subtracted and not added. the shortcut shown is great. But I am not sure if % can be worked that ways always.
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