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Discussion :: Area

  1.  

    A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paise per sq. m, is:

  2. A.

    Rs. 456

    B.

    Rs. 458

    C.

    Rs. 558

    D.

    Rs. 568

    View Answer

    Workspace

    Answer : Option C

    Explanation :

     

    Area to be plastered = [2(l + b) x h] + (l x b)
      = {[2(25 + 12) x 6] + (25 x 12)} m2
      = (444 + 300) m2
      = 744 m2.

     

      Cost of plastering = Rs.[744 x \( \frac { 75 } { 100 } \)] =Rs. 558.


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