A room is 16 m long ,7 m broad and 8 m high. Find the cost of white washing the four walls of room at Rs. 7.5 per `m^(2)`, white washing is not to be done on the doors and windows , which occupy `65 m^2`.

Explanation

Area of 4 walls of a room`=2(16+7)xx8=368m^2`
Nt area of 4 walls`=368-65=303m^2`
therefore Cost of white washing =` 303xx7.5=₹2272.5`