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If a sum of money doubles itself at com...

If a sum of money doubles itself at compound interest in n years, then it will be 4 times in

A

2 n years

B

`n/2` yrs

C

3n yrs

D

`n/3` yrs

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Knowledge Check

  • A sum of money invested at compound interest doubles itself in six years. In how many years will it becomes 64 time itself at the same rate of compound interest ?

    A
    30
    B
    36
    C
    42
    D
    48

  • A sum of money doubles itself in 3 years. How many times itself will the sum become in a period of 9 years at simple interest ?

    A
    4
    B
    6
    C
    8
    D
    9

  • The sum of money doubles itself in 20 years at a simple interest. The number of years in which it becomes thrice is :

    A
    30
    B
    40
    C
    50
    D
    45

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    A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to four times itself?

    If the simple interest of a certain sum of money for 1 year is Rs. 50 and compound interest for 2 years is Rs. 102, then find the sum of money and the rate of interest.

    A sum of money at simple interest triple itself in 15 years. It will become 5 times of itself in ____

    Answer the followings questions (any ten) : A sum of money is doubled in 8 years at r% rate of compound interest per annum. At the same rate in how many years it will be four times of the sum?

    At the rate of compound interest of 10% per annum, find the sum of money for which the difference of compound interest and the simple interest in 2 years is Rs. 500.

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