Manish borrows a sum of Rs 54000 at 10% pa compound interest. He repays a certain amount at the end of one year and the balance amount of Rs 32340 at the end of second year. What amount does he repay in the first year.
1. Rs 30000
2. Rs 24000
3. Rs 29400
4. Rs 34000
5. None of these
Correct Answer – Option 1 : Rs 30000
Solution:
Given: Sum Manish borrows = 54000
Amount repaid by Manish at the end of second year = 32340
Rate of interest = 10%
Concept used: Amount at the end of second year = Amount at the end of first year {1 + (rate/100)}
Calculation: Compound interest for first year = (54000 × 10)/100
⇒ 5400
Amount at the end of first year = 54000 + 5400
⇒ 59400
Let the amount repaid be Rs x
Then, the sum at the beginning of the second year = 59400 – x
Amount at the end of second year = (59400 – x) + [{(59400 – x) × 10}/100]
⇒ (59400 – x) + [{(59400 – x) × 10}/100] = 32340
⇒ 59400 – x + 5940 – 0.1x = 32340
⇒ 65340 – 1.1x = 32340
⇒ 1.1x = 65340 – 32340
⇒ 1.1x = 33000
⇒ x = 30000
∴ Amount repaid by Manish at the end of first year = 30000