A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine: (i) The area of the sheet required for making the box. (ii) The cost of sheet for it, if a sheet measuring `1m^2` costs Rs 20.

A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. Its is opened at the top. Ignoring the thickness of the plastic sheet: determine the area of the sheet requried for making the box.

A wooden box 1.5 m long, 1.25 m wide and 65 cm deep and open at the top is to be made. Find the cost of wood required for it, if Rs 30 is the cost of 1 metre square of wood.

A joker’s cap is in the form of a right circular cone of base radius 7 cm and height 24 cm. Find the area of the sheet required to make 100 such caps if 1m^2 of sheet used for making cap costs Rs 700.

A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank.

A cuboidal oil tin is 50 cm by 30 cm by 40 cm.Find the cost of the tin required for making 20 such tins.If the cost of tin sheet is Rs. 20 per square metre.

A conical tent is 10 m high and the radius of its base is 24 m. Find cost of the canvas required to make the tent, if the cost of 1 m^2 canvas is Rs 70.

A class room is 7 m long, 6.5 m wide and 4 m high. It has one door 3mxx1.4m and three windows 2mxx1m . The interior walls are to be white rushed. The contractor charges Rs 10.50 per square metre. Find the total cost of white washing.

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.)