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Home Aptitude Compound Interest See What Others Are Saying!
  • Question
  • The difference between the compound interest and the simple interest on a certain sum at 12% p.a. for two years is Rs.90. What will be the value of the amount at the end of 3 years?


  • Options
  • A. 8560
  • B. 8673
  • C. 8746
  • D. 8780.80

  • Correct Answer
  • 8780.80 

    Explanation

    when interest is reckoned using compound interest, interest being compounded annually. The difference in the simple interest and compound interest for two years is on account of the interest paid on the first year's interest  Hence 12% of simple interest = 90 => simple interest =90/0.12 =750.

    As the simple interest for a year = 750 @ 12% p.a., the principal =750/0.12 = Rs.6250.

    If the principal is 6250, then the amount outstanding at the end of 3 years = 6250 + 3(simple interest on 6250) + 3 (interest on simple interest) + 1 (interest on interest on interest) = 6250 +3(750) + 3(90) + 1(10.80) = 8780.80.


  • More questions

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    • Options
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    • C. $200, $150, $100
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    • 2. 
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    • Options
    • A. 50 ?3 m
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    • 3. 
      If 30% of A = 20 % of B, then find the value of A : B?

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    • A. 1 : 3
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    • 4. 80 litre mixture of milk and water contains 10% milk. How much milk (in litres) must be added to make water percentage in the mixture as 80%?

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    • 5. 
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    • Options
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    • 7. 
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