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A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of Rs. 16 per 100 

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Inner radius (r) of hemispherical bowl Surface area of hemispherical bowl = 2πr2 Cost of tin-plating 100 cm2 area = Rs 16 Cost of tin-plating 173.25 cm2 area = Rs 27.72 Therefore, the cost of tin-plating the inner side of the hemispherical bowl is Rs 27.72.
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Inner radius (r) of hemispherical bowl 

Surface area of hemispherical bowl = 2πr2

Cost of tin-plating 100 cm2 area = Rs 16

Cost of tin-plating 173.25 cm2 area  = Rs 27.72

Therefore, the cost of tin-plating the inner side of the hemispherical bowl is Rs 27.72.

 

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Rs. 27.6948 /-
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