This question was asked in 2010 cbse board exam. Question from RS Aggarwal book chapter volume and surface area of solid, page number 829, exercise 17D, problem number 38
A milk container is made of metal sheet in the shape of frustum of a cone whose volume is 1045937 cm³ . The radii of its lower and upper circular ends are 8 cm and 20 cm, respectively. Find the cost of metal sheet used in making the container at the rate of 1.40 per cm².
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