Quantitative Aptitude Ques 1941

Question: A certain scheme of investment in simple interest declares that it trebles the investment in 8 yr. If you want to quadruple your money through that scheme, you have to invest it for

Options:

A) 11 yr

B) 14 yr

C) 10 yr

D) 12 yr

Show Answer

Answer:

Correct Answer: D

Solution:

  • Principal = Rs. x, Amount = Rs. 3x Case I SI = Amount $ - $ Principal = Rs. 2x

$ \therefore $ $ \text{Rate=}\frac{\text{SI }\times\text{ 100}}{\text{Principal }\times\text{ Time}} $ $ =\frac{2x\times 100}{x\times 8}=25 $ % Case II $ \text{Time=}\frac{\text{SI }\times\text{ 100}}{\text{Principal }\times\text{ Rate}}=\frac{3x\times 100}{x\times 25}=12yr $

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