SUCCESSIVE discount are 15% and 50%.Formula used:Successive discount = X + Y - (XY)/100Where,X = First discountY = Second discountCalculation:Successive discount = X + Y - (XY)/100X = 15%, Y = 50%⇒ 15 + 50 - 750/100⇒ 57.5%∴ The single equivalent discount is 57.5%. Let the SELLING PRICE before discount be Rs. 100Now the effective discount after 2 successive discounts can be given as⇒ 100 × (1 - 15/100)(1 - 50/100) = 100 × 0.85 × 0.50⇒ final selling price is Rs. 42.5⇒ Discount is 100 – 42.5 = Rs. 57.5∴ the discount percentage is 57.5%