Answer :
Given ; inner circumference = 2πr1 = 44
r1 = 7dm
outer circumference = 2πr2 = 45
r2 = 7.16dm
height (h) = 3.5m = 35 dm
Total area of painting pipe = inner curved surface area + outer curved surface area of cylinder
= 2π r1h + 2π r2h
= 2π h(r1 + r2)
= 22 × 14.16
= 311.52 dm2
As, cost of 1 dm2 = Rs 2
So, cost of 311.52 dm2 = Rs(2 × 311.52) = Rs. 623.04
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