1.

The radius of a 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 Rs. 20 per cm2? \(\left( {Take\;\pi \; = \;\frac{{22}}{7}} \right)\)

A. Rs. 5280
B. Rs. 26400
C. Rs. 105600
D. Rs. 108600
Answer» D. Rs. 108600


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