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Curved surface area of a cylinder = 2πrh

Curved surface area of hemisphere = 2πr2

Given, external diameter of the cylinder be 1.4 m and its length be 8 m

Thus r = 0.7m and h = 8m

Total curved surface area = 2πrh + 2πr2

Total curved surface area = 2 × (22/7) × 0.7 × 8 + 2 × (22/7) × 0.72 = 38.28 m2

Cost of painting it on the outside at the rate of Rs. 10 per m2 = 38.28 × 10 = Rs. 382.80

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