If the simple interest on a sum of money at 5% per annum for 3 years i...
Let sum = Rs. P
then

∴ C.I. = 9261 - 8000 = 1261
If the simple interest on a sum of money at 5% per annum for 3 years i...
Understanding Simple Interest
Simple interest (SI) is calculated using the formula:
SI = (Principal × Rate × Time) / 100
Here, we know:
- SI = Rs. 1200
- Rate = 5% per annum
- Time = 3 years
Now, we can rearrange the formula to find the Principal (P):
P = (SI × 100) / (Rate × Time)
P = (1200 × 100) / (5 × 3)
P = 120000 / 15
P = Rs. 8000
Calculating Compound Interest
Now, let's calculate the compound interest (CI) using the formula:
CI = P(1 + r/n)^(nt) - P
Where:
- P = Principal = Rs. 8000
- r = Rate = 5% = 0.05
- n = Number of times interest applied per time period = 1 (annually)
- t = Time = 3 years
Using the formula:
CI = 8000(1 + 0.05/1)^(1×3) - 8000
CI = 8000(1 + 0.05)^3 - 8000
CI = 8000(1.05)^3 - 8000
CI = 8000 × 1.157625 - 8000
CI = Rs. 9261 - 8000
CI = Rs. 1261
Conclusion
Therefore, the compound interest on the same sum for the same period at the same rate is:
- Rs. 1261
This confirms that the correct answer is option 'A'.