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A container made of a metal sheet open a...

A container made of a metal sheet open at the top is the form of frustum of the cone, whose height is 16 cm and the radii of its lower and upper circular edges are 8 cm and 20 cm respectively. Find
(i) the cost of metal sheet to make the container if it costs ₹ 10 per `100 cm^(2)`
(ii) the cost of milk at the rate of ₹ 35 per litre which can fill it completely.

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