20. At a store, a hat has a regular price of r dollars.
During a sale, the price of the hat is discounted
by 20%. The expression 0.8x describes the
discounted price, in dollars, of the hat. Which
expression also describes the discounted price, in
dollars, of the hat?
A. 0.21
B. x - 20
C. x -0.2
D. X-0.22