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SSC Sample Paper Mock Test-13 SSC CGL Tear-II Paper-1

  • question_answer
    At a certain rate of simple interest, a certain sum of money becomes double of itself in 10 yr. It will become treble of itself in

    A) 15 yr

    B)  18 yr  

    C)  20 yr   

    D)  30 yr

    Correct Answer: C

    Solution :

    If principal = Rs. x and rate = r% per annum, then \[\text{Rate=}\frac{\text{SI }\!\!\times\!\!\text{ 100}}{\text{Principal }\!\!\times\!\!\text{ Time}}=\frac{x\times 100}{x\times 100}=10%\] \[\therefore \]\[\text{Time=}\frac{\text{SI }\!\!\times\!\!\text{ 100}}{\text{Principal }\!\!\times\!\!\text{ Rate}}=\frac{2x\times 100}{x\times 10}=20\,\,\text{yr}\]


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