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7th Class Mathematics Comparing Quantities Question Bank Comparing Quantities

  • question_answer
    Sumitra Aunt lent some money to her friends for 6 years, for which she received Rs. 2000 as interest. If her friends paid back a total of \[Rs.\,\,12000/-,\]then what was the rate of interest?

    A) \[2\frac{1}{3}%\]                      

    B) \[4\frac{1}{3}%\]

    C) \[6\frac{1}{3}%\]            

    D) \[3\frac{1}{3}%\]

    Correct Answer: D

    Solution :

    (d) \[A=P+\frac{\Pr \,t}{100}=12000\Rightarrow \frac{\Pr \,t}{100}=2000,\]where \[P=10000\] \[\therefore \]\[12000=10000\left( 1+\frac{6r}{100} \right)\Rightarrow \frac{6}{5}=1+\frac{6r}{100}\] \[\Rightarrow \]\[\frac{1}{5}=\frac{6r}{100}\Rightarrow r=\frac{100}{30%}=3\frac{1}{3}%\]


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