Question

find the single discount which is equivalent to two consecutive discounts of 20% and 10%

Answer 1

Let the required single discount be "x"

So now as per question..
X=20% + 10%
X=20/100+10/100
X= 30/100

i.e. required single discount = 30%

Hope it helps...

Answer 2

let the cp be 100
then cp after discount = 100-20/100 ×100 =80
next cp = 80
discount = 10%
discounted price = 80- 10/100×80 = 72


then to know one single discount
100-72 = 28% dicount