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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    On what sum will the compound interest for 3 years at 5% amount s to Rs.1261?                                

    A) Rs.7000                

    B) Rs.8000             

    C) Rs.9000                

    D) Rs.1000

    Correct Answer: B

    Solution :

    Reasoning: \[C.I.=P{{\left( 1+\frac{r}{100} \right)}^{n}}-P\] \[A=P{{\left( 1+\frac{R}{2\times 100} \right)}^{2n}}\] \[=\frac{R}{4}%\] \[A=P{{\left( 1+\frac{R}{4\times 100} \right)}^{4n}}\]           \[P=\frac{1261\times 8000}{1261}=Rs.\,8000\]


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