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A bucket open at the top and made up of a metal sheet is in the form of a frustum of a cone. the depth of the bucket is 24cm and the diameter of its upper and lower circular ends are 30cm an d 10 cm respectively. find the cost of metal sheet used in it at the rate of Rs.10 per 100 Sqcm.
Diameter of upper end of bucket = 30 cm
 Radius (r1) of upper end of bucket = 15 cm
Diameter of lower end of bucket = 10 cm
Radius (r2) of lower end of bucket = 5 cm
Height (h) of bucket = 24 cm
Slant height (l) of frustum =


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