a container open from the top and made from metal sheet is in the form of frustum of a cone of height 16cm. with the radii of its lower and upper and are 8 cm and 20 cm respectively find the cost of milk which can completely fill the container at the rate of₹ 50 per litre also find the cost of metal sheet used to make the container if the cost is Rs 10 per 100 cm square
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