A man donates 10 aluminium buckets to an orphanage . A bucket made of aluminium is of height 20cm and has its upper and lowest ends of radius 36 cm and and 21 cm respectively . Find cost of preparing 10 buckets if the cost of aluminium sheet is Rs . 42 per 1000 cm2 . Write your comments on the act of the man.
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Surface area of bucket = π(r1 + r2)l + πr12
l = √[h2 + (r2 - r1)2]
= √625 = 25 cm
∴ Surface area of 1 bucket = 22/7 × 1866 cm2
Surface area of 10 buckets = 22/7 × 18660 cm2
Cost of aluminium sheet = Rs. 24631.20.
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