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500% [#permalink] New post 09 Apr 2009, 08:59
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A mechanic bought 150 oil filters from a wholesaler for D dollars. He then sold the filters to his customers at 500% of the original price per filter. In terms of D, what was the cost of each oil filter for the mechanic’s customers?

Each filter sold at 500% will make the price 6D. Right?

6D/150 = D/25 (is my answer).

Official answer is 2D/75. Where am i going wrong !!
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Re: 500% [#permalink] New post 09 Apr 2009, 09:18
D becomes 5D and not 6D,IMO

hence OA=5D/150=D/30

source?
jeevanchand wrote:
A mechanic bought 150 oil filters from a wholesaler for D dollars. He then sold the filters to his customers at 500% of the original price per filter. In terms of D, what was the cost of each oil filter for the mechanic’s customers?

Each filter sold at 500% will make the price 6D. Right?

6D/150 = D/25 (is my answer).

Official answer is 2D/75. Where am i going wrong !!

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Re: 500% [#permalink] New post 10 Apr 2009, 00:28
Agree with nitya34..should be D/30.
nitya34 wrote:
D becomes 5D and not 6D,IMO

hence OA=5D/150=D/30

source?
jeevanchand wrote:
A mechanic bought 150 oil filters from a wholesaler for D dollars. He then sold the filters to his customers at 500% of the original price per filter. In terms of D, what was the cost of each oil filter for the mechanic’s customers?

Each filter sold at 500% will make the price 6D. Right?

6D/150 = D/25 (is my answer).

Official answer is 2D/75. Where am i going wrong !!
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Re: 500% [#permalink] New post 11 Apr 2009, 03:14
I agree too. Should be D/30.

Source?
Re: 500%   [#permalink] 11 Apr 2009, 03:14
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