The length of diameter of base of a hemispherical tomb is 42 dcm. Calculate the cost of colouring the upper surface of the tomb at the rate of ₹ 35 per square metre.

The diameter of a hemisphere iron-ball is 42 d cm . Calculate the cost of colouring the upper surface of it at the rate of ₹1.50 per square-meter.

External diameter of a hemispherical wooden pot is 10 cm and its thickness is 1 cm. Calculate the cost of colouring the pot at the rate of Rs 10 per square cm.

The outer diameter of a pipe is 70 cm and it is 21 m long. Find the cost of painting the outer surface of the pipe at the rate of Rs 10 per square metre

The diameter of a hollow hemispherical lid is 7 m. Find the cost of painting outer surfaces of 10 such lids at the rate of Rs. 20 per m^(2) .

Combination of cylinder and hemisphere: A solid is in the form of a cylinder with hemispherical ends.The the whole length of the solid is 108cm and the diameter of the hemispherical ends is 36cm; Find the cost of polishing the surface of the solids at the rate of 7 paise per sq.cm.

The internal and external diameters of a semicircular hollow sphere are 25 cm and 25 cm respectively. Calculate the cost of colouring the hemisphere at the rate ₹0.05 per square meter.

A solid is composed of a cylinder with hemispherical ends. If the whole length of the solid is 108 cm and the diameter of the hemispherical ends is 36 cm, find the cost of polishing the surface of the solid at the rate of 10 paise per cm^2 .

Both ends of right circular cylindrical tank are semicircular . If diameter of the tank be 1.4 metre and length be 5 metre , then what will be the expenditure of colouring the external surface of the tank at the rate of Rs 10 per square - metre ?