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A bucket made up of a metal sheet is in the form of a frustum of cone of height 16 cm with radii of its lower and upper ends 8 cm and 20 cm respectively. Find the cost of the bucket if the cost of metal sheet used is Rs. 15 per 100 cm2. (use = 3.14)
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

Here r1 = 8 cm, r2 = 20 cm, h = 16 cm

l =

Surface area of the bucket = l (r1 + r2) + r12

= 3.14 20 28 + 3.14 64

= 3.14 (560 + 64)

= 1959.36 sq. cm

Cost of 100 sq. cm metal = Rs. 15

Cost of 1 sq. cm metal = Rs. 0.15

Cost of 1959.36 sq. cm metal = Rs. 293.90

Answered by | 04 Jun, 2014, 03:23: PM

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