Question

a closed metallic cylinder has it's base 56 cm and it is 2.72 m high. Find the cost of metal used to make it if, it costs ₹80 per square metre.

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Answer 1

Diameter of base of closed metallic cylinder = 56 cm

So, its radius; r = 56/2 = 28 cm = 0.28 m
Height; h = 2.72 m

Total surface area of metallic cylinder = 2πr(r+h) = 2×22/7×0.28(0.28+2.72) 
=5.2752 m²
Cost of making per square meter of metal = Rs.80

So, total cost of making the whole metal = 5.2752×80 = Rs.422.016

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