Surface areas and volumes (frustum of a cone related problem)

#frustumofacone#importantmodel#exercise 13.4.4#
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 16 cm with radii of its lower and upper ends as 8 cm and 20 cm, respectively. Find the cost of the milk which can completely fill the container, at the rate of Rs.20 per liter. Also find the cost of metal sheet used to make the container, if it cost Rs.8 per 100 cm^2.(Take pi = 3.14)
The above problem solution is explained in tamil

Exercise 13.4.4 page no.257,sum related to frustum of a cone,10th mensuration problems,