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A bucket made of aluminum sheet is of height 20cm and its upper and lower ends are of radius 25cm an 10cm, find cost of making bucket if the aluminum sheet costs Rs 70 per 100cm2

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Given height of bucket (h) = 20cm 

Upper radius of bucket  (r1)  = 25cm 

Lower radius of bucket (r2) = 10cm 

Let ‘l’ be slant height of bucket

Slant height of bucket (l) = 25cm

Curved surface area of bucket

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