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Question 140
What will be total cost of polishing curved surface of a wooden cylinder at rate of ₹20 per m$$^2$$, if its diameter is 40 m and height is 7 m?
Solution
Given, Diameter of the cylinder = 40 m
Radius of the cylinder = 20 m
Height of the cylinder = 7 m
Curved surface area of the cylinder = $$2\pi r h$$
$$= 2\times\dfrac{22}{7}\times20\times7 = 880 m^2$$
For 1 sq.m, Rs.20 will be charged.
Then, for 880 sq.m, Rs.20*880 = Rs.17600 will be charged.
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