# The floor of a rectangular hall has a perimeter of 250 m . its height is 6m . Find the cost of painting its four walls (including doors , etc. ) at the rate of Rs 6 per square metre.

Solution :  We know that the area A of the four walls of a room is given by

A = perimeter of the floor of the room $\times$ Height

Here , perimeter of the floor = 250m , and height =6m

$\therefore$             Area of the four walls of the room $=(250\times6)m^2=1500m^2$

We have ,

cost of painting of 1 square metre $=Rs 6$

$\therefore$            cost of painting the four walls $=Rs(6\times 1500)=Rs9000$

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