A bucket has top and bottom diameters of 40 cm and 20 cm respectively. Find the volume of the bucket if its depth is 12 cm. Also, find the cost of tin sheet used for making the bucket at the rate of Rs. 1.20 per dm2.

Radius of top of the bucket, r’ = 40/2 = 20 cm


Radius of bottom of the bucket, r’’ = 20/2 = 10 cm


Depth, h = 12cm


Volume of the bucket =



= 8800 cub. cm


Let l be slant height of the bucket




l = 15.62 cm


Total surface area of bucket = π (r’ + r’’) × l + π r’’2


= π (20 + 10) × 15.620 + π (10)2


= 17.81 dm2


Cost of tin sheet = 1.20 × 17.87 = Rs21.40


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