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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    Find the sum of money which increases by \[=\frac{3}{2}years\]of itself every year and amounts to Rs.450 in 5 years. If calculated as per simple interest formula.

    A) Rs.100                  

    B) Rs.150

    C) Rs.300              

    D) Rs.400

    Correct Answer: C

    Solution :

    Reasoning: If sum be Rs. 100, in each year, it increases by\[x=19\times \frac{280}{380}\times \frac{22}{20}\times \frac{10}{11}=Rs.14,\]. i.e., by Rs.10; so the interest is 10%. Amount is Rs. 450. \[\frac{m}{n}=\frac{5}{8}=\frac{8m}{5}\] Principals \[n=\frac{8\times 6}{5}=\frac{48}{5}=\frac{48}{5}\] \[\frac{48}{5}\]    


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