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.