Answer :

Given that, radius of the circular lid of a tank, r = 1.4 m


Now this lid is painted on both sides. So, we need to find area of both sides of the circular lid.


Area of one side = πr2


= 22/7 × 1.42


= (22 × 1.4 × 1.4)/7


= 43.12/7


= 6.16


Area of both sides = 2 × Area of one side


= 2 × 6.16


= 12.32


So, area painted on both sides of 1 circular lid = 12.32 m2


Then, area painted on both sides of 100 such circular lid = 12.32 × 100 = 1232 m2


Cost of painting 1 m2 area = Rs. 20


Cost of painting 1232 m2 area = 20 × 1232 = Rs. 24640


Thus, it will cost Rs. 24,640 to paint 100 such lids at the rate of Rs. 20 per m2.


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