Difficulty: Easy
Correct Answer: Rs.8820
Explanation:
Introduction / Context:
This is a straightforward compound interest calculation where the principal, rate, and time are given, and we need to find the maturity amount. The question mimics a fixed deposit scenario in which the interest is compounded annually at a rate of 5% for 2 years on a principal of Rs 8000.
Given Data / Assumptions:
Concept / Approach:
The amount A after t years at compound interest with annual compounding is given by:
A = P * (1 + r / 100)^t
Here, r = 5 and t = 2, so we use the factor (1.05)^2. Once A is calculated, that is the maturity amount Albert receives from the fixed deposit.
Step-by-Step Solution:
P = 8000, r = 5%, t = 2 years.
Compute the amount factor: (1 + 5 / 100)^2 = (1.05)^2.
(1.05)^2 = 1.1025.
Therefore, A = 8000 * 1.1025.
A = Rs 8820.
So Albert will receive Rs 8820 on maturity.
Verification / Alternative Check:
We can also compute year by year.
End of year 1: amount = 8000 + 8000 * 5 / 100 = 8000 + 400 = 8400.
End of year 2: interest on 8400 = 8400 * 5 / 100 = 420.
Final amount = 8400 + 420 = Rs 8820, which matches the earlier calculation.
Why Other Options Are Wrong:
Rs. 8620 and Rs. 8520 are lower than the correct maturity amount and ignore full compounding for both years.
Rs. 8320 is far too low and would correspond to a lower interest rate or shorter time.
Common Pitfalls:
Sometimes students apply simple interest instead of compound interest and compute interest only on the original principal each year.
Others may miscalculate (1.05)^2 or multiply incorrectly.
Final Answer:
The amount Albert receives on maturity is Rs. 8820.
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