A store is having a sale. Sally wants to buy an $80 item at the store. Which of the following equations gives the discount price, y, in dollars, of the $80 item after a discount of x percent?
A. y = 80 + 0.8 x
B. y = 80 – 1.25 x
C. y = 80 + 1.25 x
D. y = 80 – 0.8 x