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A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin-plating

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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 cm2 .

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Inner diameter of hemispherical bowl = 10.5 cm.

= 173.25 cm2 . 

Cost of tin-plating for 100 cm2 is Rs. 16. 

Cost of tin-plating for 173.25 sq.cm. …?…

= Rs. 27.72.

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