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Mathematical Aptitude - Interest

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11. Yugpurush paid an interest of Rs 11400 after 9 years. For the first two years, the simple interest was 6%, for next three years it was 9%, and for next four years, it was 14%. How much the principal money was borrowed by him?

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12. Some amount becomes Rs 900 in 3 years if calculated on compound interest, and the same amount becomes Rs 1000 in the 4th year. What was the principal amount and rate of interest?

  • Option : C
  • Explanation : Hint: First calculate that Rs 900 becomes Rs 1000 in fourth year. Calculate rate of interest by application of simple interest formula. Thereafter principal amount can also be calculated.
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13. Rs 2000 is invested each on simple interest and compound interest. What will be the difference between their amounts of simple interest and compound interest if the rate of interest on each investment is 10% per annum and the time span is 3 years?

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14. Manish gets Rs 26000 by making an investment of Rs 20000 in 5 years at some simple rate of interest. Had the investment been made at an other place where rate of interest is 3% higher, how much amount Manish would have made during the same duration?

  • Option : A
  • Explanation : Hint: First initial R can be calculated, and then 3% added to it.
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15. Navjot gets a salary of Rs 8600. The salary was invested by him in two parts. Find the difference between the two parts of his salary, if in first part he got some simple interest at 15% per annum in 4 years, which was same as the second part which he invested at 20% for 3 years.

  • Option : A
  • Explanation : We can solve this question directly.
    The simple interest amount is same in both cases.
    15 × 4 = 20 × 3
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