12. Five mark exercise problem IV

A container open at the top is in the form of a frustum of a cone of height 16 $cm$ with radii of its lower and upper ends are 8 $cm$ and 20 $cm$ respectively. Find the cost of milk which can completely fill a container at the rate of $₹40$ per litre.

 

Answer:

 

Cost of milk that will fill the container $=$ $₹$

 

[Note: Round off the cost to two decimal places.]