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Question

Four circular widows, each of radius 28 cm are to be fitted with glass. Calculate the cost of glass at the rate of Rs. 4.25 per sq. m.


  1. Rs. 4.20

  2. Rs. 8.20

  3. Rs. 9.20

  4. Rs. 3.8


Solution

The correct option is A

Rs. 4.20


Radius of a circular window = 28 cm =28100 m

Area of one window = 227× (28100)2 = 0.2464 m2

So, area of four walls = 4 (0.2464) = 0.9856 m2

Hence, cost of four windows = Rs.  4.25 × 0.9856

= Rs. 4.20

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