A round table cover has six equal designs as shown in fig. If the radius of the cover is 28 cm, find the cost of making the designs at the rate of ? 0.35 per `cm^2`. (use `sqrt 3=1.7)`

A mirror is fitted into four circular windows of radius 28 cm. Find the cost of fitting the mirror at the rate of Rs. 4.25 per m^2

The dome of a building is in the form of a hemisphere. Its radius is 63 dm. Find the cost of tin-plating it on the inside at the rate of Rs. 2 per 100cm^2 .

A hemispherical bowl made of brass has inner diameter 105 cm. Find the cost of tin-plating it on the inside at the rate of Rs 16 per 100 cm^2 .

A cylindrical vessel open at the top has a dimeter 20 cm and height 14 cm. Find the cost of tin-plating it on the inside at the rate of 70 paise per 100 cm^2 .

A tent is in the shape of a cylinder surmounted by a conical top.If the height and diameter of the cylindrical part are 2.1m and 4 m respectively, and the slant height of the top is 2.8 m, find the area of the canvas used for making the tent. Also, find the cost of the canvas of the tent at the rate of Rs 500 per m^2 (Note that the base of the tent will not be covered with canvas.)

A cylindrical vessel, without lid, has to be tin-coated on its both sides. If the radius of the base is 70cm and its height is 1.4m, calculate the cost of tin-coating at the rate of Rs. 3.50 per 1000 cm^2 .

A hemispherical bowl of steel is of thickness 0.3 cm (See Fig) If the inner radius of the bowl is 7 cm, find the volume of the steel used in making the bowl.