Q : 5 A hemispherical bowl made of brass has inner diameter . Find the cost of tin-plating it on the inside at the rate of Rs 16 per .
The inner radius of the hemispherical bowl =
The curved surface area of a hemisphere =
The surface area of the hemispherical bowl =
Cost of tin-plating = Rs 16
Cost of tin-plating =
Therefore, the cost of tin-plating it on the inside is