Question

what single discount is equivalent to two successive discount of 10% and 15%?

Answer 1

Discount of 10% = 90

Discount of 15% of 90 = 76.5.

Single discount = 100 - 76.5

                          = 23.5

Answer 2

Cost of the object for discount 10% = 90% Of Original price .

Again allowing a discount of 15% on remaining 90% =15/100*90=13.5

Now the cost becomes =90-13.5=76.5 %

So Total discount to replace 10% and 15% is 23.5% [ 100-76.5]