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A container opened at the top and made u...

A container opened at the top and made up of a meta! sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 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 meta! sheet used to make the container, if it costs Rs. 10 per `100 cm^2` ? ( Take ` pi ` = 3.14).

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The correct Answer is:
Rs 156.75
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