# A container, open

Given: height of frustum container = h = 24 cm

Radius of lower circular end = r = 8 cm

Radius of upper circular end = R = 20 cm

Cost of 1 litre milk = 24 Rs

Volume of milk completely fill the container = volume of frustum of cone

= 8 × 3.14 × (400 + 64 + 160) cm3

= 8 × 3.14 × 624 cm3

= 15674.88 cm3

Now, 1 litre is 1000 cm3

15674.88 cm3 = 15674.88/1000 = 15.67488 litres

Cost of milk which can completely fill the container = 15.67488 × cost of 1 litre milk

= 15.67488 × 24 Rs

= 376.19712 Rs

Cost of milk which can completely fill the container = 376.19712 Rs

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