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)