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Connie paid a sales tax of 8 percent on her purchase. If the

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Connie paid a sales tax of 8 percent on her purchase. If the [#permalink] New post 09 May 2008, 17:58
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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Re: GMAT Prep #10 [#permalink] New post 09 May 2008, 18:00
E

3% = $12
1% = $4

100% = $400

8% = $32

400 + 32 = 432
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Re: GMAT Prep #10 [#permalink] New post 09 May 2008, 18:03
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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Re: GMAT Prep #10 [#permalink] New post 09 May 2008, 20:11
gmatnub wrote:
E

3% = $12
1% = $4

100% = $400

8% = $32

400 + 32 = 432


I like this approach :)
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Re: GMAT Prep #10 [#permalink] New post 09 May 2008, 20:21
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! :lol:
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Re: GMAT Prep #10 [#permalink] New post 04 Dec 2011, 10:43
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, 10:43, edited 1 time in total.
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Re: GMAT Prep #10 [#permalink] New post 05 Dec 2011, 08:04
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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Re: GMAT Prep #10   [#permalink] 05 Dec 2011, 08:04
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