A certain amount will become six times in 20 years. How long does it take for the same amount to become 5 times? Assume the same rate of simple interest in each case. |
16 years 8 months 15 years 8 months 15 years 16 years |
16 years |
let principle = Rs100 100 becomes 600 in 20 years So Interest = 600-100=Rs 500 Now 100 becomes 500 (5 times) ∴ Interest = Rs 400 Interest becomes \(\frac{4}{5}\) times Then time also becomes \(\frac{4}{5}\) times ∴ \(\frac{20×4}{5}\) = 16 years |