A hemispherical bowl made of brass inner diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of Rs 16 per `100cm^(2).`

A cylindrical pilar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of Rs 12.50 per m^(2).

A storage tank consists of a circular cylinder with a hemisphere stuck on either end. If the external diameter of the cylinder be 1.4 cm and its length be 8 m. Find the cost of painting it on the outside at rite of Rs. 20per m^2 .

The inner diameter of a circular well is 3.5 m. It is 10m deep. Find the cost of plastering this curved surface at the rate of Rs 40 per m^(2).

The area of a circular playground is 22176 m^2 . Find the cost of fencing this ground at the rate of Rs 50 per metre.

A path 1 m wide is built along th eborder and inside a square garden of side 30m. Find: the cost of planting grass in the remaining portion of the garden at the rate of Rs.40 per m^2 .

The slant height and base diamater of a conical tomb are 25 m and 14m respectively. Find the cost of with-washing its curved surface at the rate of Rs 210 per 100 m^(2).

The slant height and base diameter of a conical tomb are 25 m and 14 m respectively. Find the cost of white washing its curved surface at the cost of Rs 210 per 100m^(2).

A round table cover has six equa designs as shown in Fig. 5.14. If the radius of the cover is 28 cm, find the cost of making the desingns at the rate of Rs 0.35 per cm^(2). (" Use "pi=3.14).

The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find (i) Its inner curved surface Area, (ii) The cost of plastering this curved surface at the rate of Rs 40 per m^(2).