2. Questions Bank
  3. 10th Class
  4. Mathematics
  5. Related to Competitive Exam

10th Class Mathematics Related to Competitive Exam Question Bank Commercial Mathematics

  • question_answer
    At a certain rate of simple interest, a certain    doubles itself in 10 years. It will triple itself  

    A)  12 years          

    B)         15 years          

    C)  20 years           

    D)         30 years

    Correct Answer: C

    Solution :

     Let sum \[=x\]. Then, S.I. = x and Time = 10 years. \[\therefore \]  Rate \[=\left( \frac{100\times x}{x\times 10} \right)%=10%\] Now,   sum = x, S.I. = 2x, Rate = 10% \[\therefore \]     Time  \[=\left( \frac{100\times 2x}{x\times 10} \right)\] years = 20 years.


You need to login to perform this action.
You will be redirected in 3 sec spinner