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SSC Sample Paper Mock Test-3 SSC CGL Tear-II Paper-1

  • question_answer
    A sum of money invested at compound interest amounts to Rs. 650 at the end of first year and Rs 676 at the end of second year. The sum of money is

    A)  Rs. 600            

    B)  Rs. 540     

    C)  Rs. 625

    D)  Rs. 560   

    Correct Answer: C

    Solution :

    Interest on Rs. 650 for 1 yr \[=9+6=15\]= Rs.26 So,       \[r=\frac{26}{650}\times 100\] r = 4% per annum \[P=\frac{A}{{{\left[ 1+\frac{r}{100} \right]}^{t}}}=\frac{650}{{{\left[ 1+\frac{4}{100} \right]}^{1}}}\] \[\frac{{{(1.5)}^{3}}+{{(4.7)}^{3}}+{{(3.8)}^{3}}-3\times 1.5\times 4.7\times 3.8}{{{(1.5)}^{2}}+{{(4.7)}^{2}}+{{(3.8)}^{2}}-1.5\times 4.7-4.7\times 3.8-3.8\times 1.5}\]=Rs. 625                        


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