Dena Has a coupon for 20% off a single purchase at a store. If the item She buys cost p dollars, then the amount She will be charged is represented by the expression below.

P-0.2p

A.-0.2p

B. 0.8p

C. 1.2p

D. 1.8p

The decimal equivalent of the given percentage is 0.20. When an item is at 20% off, this means that its value becomes only 80% of the original. The decimal equivalent of this number is 0.80. This means that Dena will have to be charged only 0.80p. The answer is letter B.