GIVEN: 2 successive discounts of 35% and 45%. CONCEPT: Successive discounts. CALCULATION: Single effective discount =[1–(1–0.35)×(1–0.45)]×100 =[1–0.65×0.55]×100 =[1–0.3575]×100 =0.6425×100 = 64.25% Effective discount for a% and b% discounts = (a + b – ab/100) ∴ Effective discount for 35% and 45% discounts = 35+45–