After deducting 20% from a certain sum, and then 10% from the remainder, there is Rs. 7,200 left. Find the original sum.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. Rs. 10,000.
Given that
After deducting 20% from a certain sum, and then 10% from the remainder, there is Rs. 7,200 left.
Let an original sum be X
According to the question
The net deducting percentage = 20 + 10 - 20 × 10/100 = 30 - 2 = 28 %
⇒ (100 - 28)% × X = Rs. 7200
⇒ 72% × X= 7200
⇒ X = 7200 × 100/72 = Rs. 10,000
Hence, the original sum is Rs. 10,000.