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

  • question_answer
    If the population of a town is 64,000 and its annual increase is 10%, then its correct population at the end of 3 years will be

    A)  80,000           

    B)         85,000

    C)  85,100                 

    D)         85,184  

    Correct Answer: D

    Solution :

     Population \[(P)=64,000,\] Annual Increase \[(r)=10%\] Hence, population after 3 years                                                 \[=64,000{{\left( 1+\frac{10}{100} \right)}^{3}}\]                                                 \[=64,000\times {{\left( \frac{11}{10} \right)}^{3}}\]                                                 \[=64,000\times \frac{11\times 11\times 11}{1000}\]                                                 \[=85,184\]


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