An item is originally priced to sell for $X and is marked down Y%. A customer has a coupon for an additional Z%. What is the total percent reduction and the final selling price?

a) Total percent reduction: "Y + Z%" Final selling price: "(X - XY/100)(1 - Z/100)"
b) Total percent reduction: "Y - Z%" Final selling price: "(X - XY/100)(1 + Z/100)"
c) Total percent reduction: "Y × Z%" Final selling price: "(X - XY/100)(1 - Z/100)"
d) Total percent reduction: "Y + Z%" Final selling price: "(X + XY/100)(1 + Z/100)"