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The price of a dress is marked down 20% on May 1. On May 25th the reduced price is marked down an additional 15% to \$51. (a) What percent of the original price is the final sale price? (b) "What is the original price?

All I could think was trying to work the problem this way:

(a) 20% + 15% = 35% (total discount percentage)

100% - 35% = 65% (percent of the original price for a sale price of \$51)

(b) 65%x = \$51

x = 51/.65

x = \$78.46 (original price)

The answer given in the back of the book is given as (a) 68% and (b) \$75. Assuming the book's answer is correct, what am I missing?

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Er, it posted all garbled for some reason. I have no idea why. Any ideas?