Mosses invested Rs. 20,000 in a scheme at simple interest @ 15% per annum. After three years he withdrew the principal amount plus interest and invested the entire amount in another scheme for two years, which earned him compound interest @ 12% per annum. What would be the total interest earned by Mosses at the end of 5 years?

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Solution

S.I= $\frac{20, 000 \times 15 \times 3}{100} = 9000$
Amount = Rs 20,000+ Rs 9000= Rs 29,000
Now, CI= $29, 000 (1 + \frac{12}{100})^{2} = 29, 000 \times \frac{28}{25} \times \frac{28}{29}$
$= 36, 377.6$
A-P= 36,377.6-29,000= 7377.6
After 5 years = $7377.6 + 9000 = 16, 377.6$

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S.I= 20,000×15×3100=9000Amount = Rs 20,000+ Rs 9000= Rs 29,000Now, CI= 29,000(1+12100)2=29,000×2825×2829=36,377.6A-P= 36,377.6-29,000= 7377.6After 5 years = 7377.6+9000=16,377.6

S.I= $\frac{20, 000 \times 15 \times 3}{100} = 9000$
Amount = Rs 20,000+ Rs 9000= Rs 29,000
Now, CI= $29, 000 (1 + \frac{12}{100})^{2} = 29, 000 \times \frac{28}{25} \times \frac{28}{29}$
$= 36, 377.6$
A-P= 36,377.6-29,000= 7377.6
After 5 years = $7377.6 + 9000 = 16, 377.6$