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Home Aptitude Compound Interest Comments

  • Question
  • Find the principal if the interest compounded at the rate of 10% per annum for two years is Rs. 420 ?


  • Options
  • A. Rs. 2000
  • B. Rs. 2100
  • C. Rs. 1900
  • D. Rs. 2150

  • Correct Answer
  • Rs. 2000 

    Explanation

    Given,
    Compound rate, R = 10% per annum
    Time = 2 years
    C.I = Rs. 420
    Let P be the required principal.
    A = (P+C.I)
    Amount, A =  P 1   +   r 100 n

    (P+C.I) =  P 1   +   10 100 2

    (P+420) = P[11/10][11/10]

    P-1.21P = -420

    0.21P = 420

    Hence, P = 420/0.21 = Rs. 2000

  • Tags: GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk

    Compound Interest problems


    Search Results


    • 1. At 3% annual interest compounded monthly, how long will it take to double your money?

    • Options
    • A. 20.1
    • B. 21.1
    • C. 22.1
    • D. 23.1
    • Discuss
    • 2. Mr. Gupta borrowed a sum of money on compound interest. What will be the amount to be repaid if he is repaying the entire amount at the end of 2 years? I. The rate of interest is 5 p.c.p.a. II. Simple interest fetched on the same amount in one year is Rs. 600. III. The amount borrowed is 10 times the simple interest in 2 years.

    • Options
    • A. .I only
    • B. III only
    • C. I or II
    • D. II and Either I or III only
    • Discuss
    • 3. What will Rs.1500 amount to in three years if it is invested in 20% p.a. compound interest, interest being compounded annually?

    • Options
    • A. Rs.2592
    • B. Rs.2492
    • C. Rs.2352
    • D. Rs.2352
    • Discuss
    • 4. If a sum of Rs.12500 is invested for 1 year at 12% per annum interest being compounded semi-annually, then interest earned is

    • Options
    • A. Rs.1505
    • B. Rs.1535
    • C. Rs.1545
    • D. Rs.1550
    • Discuss
    • 5. Mr. Mike borrowed Rs. 8500 at 4% per annum C.I. The C.I. compounded annally for 2 years is :

    • Options
    • A. Rs. 9139.6
    • B. Rs. 639.6
    • C. Rs. 9193.6
    • D. Rs. 693.6
    • Discuss
    • 6. Albert invested Rs. 8000 in a scheme for 2 years at compound interest rate 5% p.a. How much amount will Albert get on maturity of the fixed deposit ?

    • Options
    • A. Rs. 8840
    • B. Rs. 8800
    • C. Rs. 8810
    • D. None
    • Discuss
    • 7. An article costs Rs 50 presently. The rate of inflation is 300%. What will be cost of this article after two years?

    • Options
    • A. Rs 200
    • B. Rs 600
    • C. Rs 800
    • D. Rs 1000
    • Discuss
    • 8. What is the least number of complete years in which a sum of money put out at 40% annual compound interest will be more than trebled?

    • Options
    • A. 3
    • B. 4
    • C. 5
    • D. 6
    • Discuss
    • 9. What would be the least number of years in which the simple interest on Rs.2600 at % will be an exact number of rupees ?

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
    • Discuss
    • 10. If you deposit $8000 into an account paying 7% annual interest compounded quarterly, how long until there is $12400 in the account?

    • Options
    • A. 2.3
    • B. 3.3
    • C. 4.3
    • D. 6.3
    • Discuss


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