An antique dealer usually charges 20 percent more than his purchase price any vase sold in his store.during a clearance sale,all items are marked 10 percent off.if the dealer sells a vase during the clearance sale,his profit on the vase(sale price minus purchase price) is what percent of the purchase price of the vase?
a. 8%
b. 9%
c. 10%
d. 11%
e. 12%