28. A fez, the cap used by a jocker is shaped like frustum of a cone. – InterviewSolution

1.	28. A fez, the cap used by a jocker is shaped like frustum of a cone. If its radius on the open side is10 cm, radius at upper base is 4 cm and its slant height is 15 cm, find area of material used formaking it. Also find the cost of the material used to make the cap, if its cost 7 per 10 cm2
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