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8th Class Mathematics Comparing Quantities Question Bank Commercial Mathematics

  • question_answer
    Number of years in which Rs. 400 will earn Rs. 42 as simple interest at \[3\frac{1}{2}%\] p.a. is        

    A) 5  years           

    B)          3 years       

    C) 6 years            

    D)           \[3\frac{1}{2}\] years

    Correct Answer: B

    Solution :

        P = Rs. 400, S.I = Rs. 42, \[R=\frac{7}{2}%\,T=?\] \[T=\frac{S.I\times 100}{P\times R}\] \[\frac{42\times 100\times 2}{400\times 7}\,=3\]years


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