A container, open from the top and made of a metal 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 (in rupees) of the milk which can completely fill the container, at the rate of ₹ 20 per litre. Also, find the cost (in rupees) of metal sheet used to make the container, if it costs ₹ 8 per 100cm2. (Take π = 3.14).

A container, open from the top and made of a metal sheet, is in the fo

1.	A container, open from the top and made of a metal 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 (in rupees) of the milk which can completely fill the container, at the rate of ₹ 20 per litre. Also, find the cost (in rupees) of metal sheet used to make the container, if it costs ₹ 8 per 100cm2. (Take π = 3.14).
Answer» A container, open from the top and made of a metal 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 (in rupees) of the milk which can completely fill the container, at the rate of ₹ 20 per litre. Also, find the cost (in rupees) of metal sheet used to make the container, if it costs ₹ 8 per 100 $c m^{2}$ . (Take $π$ = 3.14).