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suppose Brian is in the market for a used textbook and the campus bookstore is having a sale. if the inital price of the used book is $85 and the discounted price is $55 

          suppose Brian is in the market for a used textbook and the campus bookstore is having a sale. if the inital price of the used book is $85 and the discounted price is $55

Added by Guillermo H.

Elementary and Intermediate Algebra
Elementary and Intermediate Algebra
Alan S. Tussy, R. David Gustafson 5th Edition
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suppose Brian is in the market for a used textbook and the campus bookstore is having a sale. if the inital price of the used book is $85 and the discounted price is $55
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Transcript

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00:01 Suppose that a bookstore buys a textbook from the publisher for $80.
00:07 At what price should the bookstore mark the textbook so that it may be offered at a 10 % at a discount of 10%.
00:15 So we want a discount of 10%, but still give the bookstore a 35 % profit on the $80 investment.
00:26 So we still want a profit of 35%.
00:31 So we're going to multiply the $80 by 135%.
00:38 Which is 1 .35 as a decimal.
00:42 So we get 80 times 1 .35, which is 135 % as a decimal.
00:50 And that gives us 108.
00:52 And the reason we did that is that 35 % represents the profit we want, and the 100 % represents the original value...
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