GIVEN:Selling price = Rs. 342A SHOPKEEPER gives successive discounts of 20%, 10%, and 5%FORMULA used:Successive discount = a + b - ab/100Selling price = MARKED price × (100 - Discount)%Calculation:Discount of 20% and 10% = 20 + 10 - 200/100 = 28%Discount of 28% and 5% = 28 + 5 - (28 × 5)/100 = 31.6%So total discount = 31.6%342 = M.P × 68.4/100⇒ Marked price = 342000/684 = 500