8th Class Mathematics Comparing Quantities Question Bank Comparing Queantities

  • question_answer There is 80% increase in an amount in 8years at simple interest. What will be the compound interest of Rs. 14000 after 3 years at the same rate.

    A)  Rs. 3794                      

    B)  Rs. 3714

    C)  Rs. 4612                      

    D)  Rs. 4634

    Correct Answer: D

    Solution :

    (d): To find rate of interest A = 1.8 P \[1.8p=p\left[ 1+\frac{8r}{100} \right]\] \[\Rightarrow 1.8-1=\frac{8r}{100}\] \[\Rightarrow 0.8=\frac{8r}{100}\] \[\Rightarrow r=10%\] C.I on 14000/- \[C.I=14000\left[ {{\left( 1+\frac{10}{100} \right)}^{3}}-1 \right]\] \[=14000\times \left[ {{1.1}^{3}}-1 \right]\] \[=14000\times 0.331\] \[=Rs.4634/-.\]

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