Question 66
The radius of solid right circular cylinder is 21 cm and its height is 40 cm. What is the cost of painting the curved surface area of the cylinder at the rate of ₹20 per cm$$^2$$?(Take $$\pi = \frac{22}{7}$$)
Solution
Curved surface area of cylinder = 2$$\pi$$ r h = $$2 \times \frac{22}{7} \times r \times h$$
= $$2 \times \frac{22}{7} \times 21 \times 40$$
Cost of painting curved surface area = $$2 \times \frac{22}{7} \times 21 \times 40 \times 20$$ = 105600
So, the answer would be option b)₹105600.
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