CBSE Class 9 Answered
A spherical metal ball has radius 4.2 cm. Find the cost of polishing 10 such balls at the rate of Rs 5 per 100 cm2.
Asked by Topperlearning User | 18 Oct, 2017, 03:15: PM
Expert Answer
Given: Radius (r) = 4.2 cm
Let S be the surface area of the sphere.
Surface area of 10 such balls = 10×221.76 cm2 = 2217.6 cm2
Cost of polishing 100 cm2 = Rs 5
Cost of polishing 2217.6 cm2 = Rs (2217.6×) = Rs 110.88
Answered by | 18 Oct, 2017, 05:15: PM
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