Mathematics · Mensuration

A hemispherical bowl has a radius of 7 cm. It is to be painted from inside as well as outside. Find the cost of painting it at the rate of Rs. 40 per 20 cm 2 ? (Take the thickness of the bowl as negligible and π = 22 7 ).

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A hemispherical bowl has a radius of 7 cm. It is to be painted from inside as well as outside. Find the cost of painting it at the rate of Rs. 40 per 20 cm 2 ? (Take the thickness of the bowl as negligible and &pi; = 22 7 ).