The difference between discount of 35% and two successive discount of 20% on a certain bill was 22, the amount of the bill is = ?

Question: The difference between discount of 35% and two successive discount of 20% on a certain bill was 22, the amount of the bill is = ?

Solution:
st discount = 35%
Single equivalent discount of 20% each
= [20 + 20 - {(20 × 20)/100}]%
= 36%

Difference = 36% - 35%
= 1%

Let the amount of the bill Tk. x
∴ (1/100) × x = 22
⇒ x/100 = 22
∴ x = 2200