The market price of a clock is ₹ 3200 . It is to be sold at ₹ 2448 at two successive discounts . If the first discount is 10 %, then the second discount is

Let rate of second discount = r %
MP = ₹ 3200 , SP = ₹ 2448 ,
r₁ = 10 % and r₂ = r %
∴ y = MP x (100 - r₁/100) (100 - r₂/100)
⇒ 2448 = [3200 x (100 - 10) x (100 - r)] / (100 x 100)
⇒ (2448 x 100 x 100) / (3200 x 90) = 100 - r
∴ r = 100 - 85 = 15 %