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The amount to which ₹ 5000 will accumulate at the effective rate of 4% for 4 years and 5% for 2 years is

Solution

Correct Option: 3

The principal is ₹5000, which grows at 4% per year for 4 years, then at 5% per year for 2 years.

The amount after the first phase becomes the principal for the second phase.


For the first 4 years at 4% rate:

Amount =5000×(1+4100)4= 5000 \times (1 + \frac{4}{100})^4

=5000×(1.04)4= 5000 \times (1.04)^4

Calculating (1.04)4(1.04)^4:

1.04×1.04=1.08161.04 \times 1.04 = 1.0816

1.0816×1.04=1.1248641.0816 \times 1.04 = 1.124864

1.124864×1.04=1.169858561.124864 \times 1.04 = 1.16985856

Amount after 4 years:

=5000×1.16985856= 5000 \times 1.16985856

=5849.29= ₹5849.29


For the next 2 years at 5% rate, the principal is ₹5849.29:

Amount =5849.29×(1+5100)2= 5849.29 \times (1 + \frac{5}{100})^2

=5849.29×(1.05)2= 5849.29 \times (1.05)^2

Calculating (1.05)2(1.05)^2:

1.05×1.05=1.10251.05 \times 1.05 = 1.1025

Final amount:

=5849.29×1.1025= 5849.29 \times 1.1025

=6448= ₹6448

Therefore, the amount accumulated is ₹6448.

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