Jamie purchased a dvd that was on sale for 15% off. the sales tax in her county is 5%. that i represent the original price of the dvd. write an expression that can be used to determine the final cost of the dvd.
a. y - 0.15y
b. 0.05(0.85y)
c. y - 0.85y + 0.05y
d. 1.05 (0.85y)

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