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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-10

  • question_answer
    If the amount is 2.25 times of the sum after 2 yr at compound interest (compound annually), the rate of interest per annum is

    A)  25%

    B)         30%

    C)  45%                

    D)  50%

    Correct Answer: D

    Solution :

    Let the principal = Rs. P and the rate of interest = r% According to question, A = Rs. 2.25 P, n = 2 yr \[\therefore \]      \[2.25P=P{{\left( 1+\frac{r}{100} \right)}^{2}}\] \[\Rightarrow \]   \[2.25={{\left( 1+\frac{r}{100} \right)}^{2}}\Rightarrow 1.5=1+\frac{r}{100}\] \[\Rightarrow \]   \[\,\frac{r}{100}=0.5\] \[\therefore \] \[r=50%\]


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