Asweater is on sale for 20% off the original price, x. which statement explains why x−0.2x and 0.8x can each find the sale price of the sweater?

a. a decrease of 2% is the same as multiplying by 80%.
b. a decrease of 20% is the same as multiplying by 80%.
c. an increase of 20% is the same as dividing by 80%.
d. an increase of 20% is the same as multiplying by 80%.