Question

find a single discount equivalent to three successive discounts of 20%,10%and 5/2%.

Answer 1

step 1 = convert 5/2 into percent = 100 divided by 5/2=40 
step 2=Let the initial price = 100 
10% discount = 100*10/100 = 10 
Remaining amount = 100 - 10 = 90 
20% discount = 90*20/100 = 18 
Remaining amount = 90 - 18 = 72 
40% discount = 72*40/100 = 28.8 
Total discount = 10+18+28.8 = 56.8 
Since the initial price is assumed as 100, the single equivalent discount = 56.8%
might be right