Q24 of 14 Page 1

An open metal bucket is in the shape of a frustum of a cone of height 21 cm with radii of its lower and upper ends as 10 cm and 20 cm respectively. Find the cost of milk which can completely fill the bucket at Rs. 30 per litre. [Use π = 22/7]

Radius of upper end r1 = 20 cm

Radius of lower end r2 = 10 cm


Height of bucket = 21 cm


Volume of Bucket =


=


= 15400 cm3


= 15.4 litre


Cost of milk = 15.4 × 30


= Rs. 462


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