Question

a discount series 0f 10,20,40 is equivalent to what single discount??

Answer 1

Let original price = Rs.100
Final price = 90% of (80% of 60% of 100)
= 90/100 * 80/100 * 60/100 * 100 = 43.20
Single discount = (100-43.20)% = 56.8 %