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Isaac can purchase a certain item in four different ways, as

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Isaac can purchase a certain item in four different ways, as [#permalink] New post 09 Nov 2010, 05:35
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

60% (02:25) correct 40% (00:44) wrong based on 35 sessions
1. Internet: $80, with no sales tax, plus $10 shipping fee
2. Store X: $90, a 10% discount, plus 10% tax on discounted price
3. Store Y: $90, no tax
4. Store Z: $90, a 10% sales tax, and $10 rebate after tax

Isaac can purchase a certain item in four different ways, as shown in the table. What is the lowest price for which he can purchase this item?

A. 88.10
B. 89.00
C. 89.10
D. 89.50
E. 90.00
[Reveal] Spoiler: OA

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Re: isaac can purchase [#permalink] New post 09 Nov 2010, 05:45
Expert's post
1. Internet: $80, with no sales tax, plus $10 shipping fee
2. Store X: $90, a 10% discount, plus 10% tax on discounted price
3. Store Y: $90, no tax
4. Store Z: $90, a 10% sales tax, and $10 rebate after tax

Isaac can purchase a certain item in four different ways, as shown in the table. What is the lowest price for which he can purchase this item?

A. 88.10
B. 89.00
C. 89.10
D. 89.50
E. 90.00


1. Internet: $80, with no sales tax, plus $10 shipping fee --> 80+10=90;
2. Store X: $90, a 10% discount, plus 10% tax on discounted price --> 90*0.9*1.1=89.1
3. Store Y: $90, no tax --> 90;
4. Store Z: $90, a 10% sales tax, and $10 rebate after tax --> 90*1.1-10=89.

So the lowest price is $89.

Answer: B.
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Re: isaac can purchase [#permalink] New post 09 Nov 2010, 07:11
An easy question i suppose could have taken max upto a minute to solve
Lowest price comes out to be 89
from Store Z: $90, a 10% sales tax, and $10 rebate after tax
which is 10% of 90 = 9 hence price + Sales tax = 90 +9 =99$
99$ - 10$ = 89$
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Re: isaac can purchase [#permalink] New post 10 Nov 2010, 04:46
thanks bunuel i didn't study q properly
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Re: isaac can purchase [#permalink] New post 29 Mar 2011, 08:00
anilnandyala wrote:
thanks bunuel i didn't study q properly


No, Anil, the issue is not about studying, but about attention... I got trapped by this question just like you did :oops:
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Re: isaac can purchase [#permalink] New post 29 Mar 2011, 08:04
a good test ,thanks for all replies.;-)
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Re: isaac can purchase [#permalink] New post 29 Mar 2011, 18:20
Option 2 = (90 - 9) + 0.1 * 81

= 81 + 8.1 = 89.10

Option 4 = 90 + 0.1 * 90 - 10

= 89
So the OA is correct - B
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Re: isaac can purchase   [#permalink] 29 Mar 2011, 18:20
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