8th Class Mathematics Comparing Quantities Question Bank Comparing Queantities

  • question_answer The value of a machine depreciates every year by 10%. If the present value of the machine is Rs.100000, what will be its value after three years?

    A)  20250                         

    B)  72900

    C)  90000             

    D)  81000

    Correct Answer: B

    Solution :

    (b): The value of the machine after depreciation of 10% per year for 3 years = \[Rs.\,100000\times \frac{90}{100}\times \frac{90}{100}\times \frac{90}{100}=72900/-\] Tip: \[9\times 9\times 9\]may be remembered as 729 It may also be remembered as, \[{{3}^{2}}\times {{3}^{2}}\times {{3}^{2}}={{3}^{6}}\]which is 729 (by doing so you are also are also revising your concepts learnt in previous chapter).

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