A container opened from the top and made up of a metal sheet is in the form of a frustum of a cone of height 15 cm and radius of its own lower and upper ends as 8 cm and 20 CM respectively find the cost of the milk which can completely filled the container at the rate of rupees per 20 per litter also find the cost of the metal sheet used to make the container if the cost of rupees 8 per 100 cm^2
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