A room is 9 m long, 8 m broad and 6.5 m high. It has one door of dimensions `2mxx1. 5 m` and three windows each of dimensions `1. 5 mxx1mdot` Find the cost of white washing the walls at Rs 3.80 per square metre.

Answer

Rs 5375

Explanation

Area of 4 walls `= [2 (9 + 8) xx 6.5] m^(2) = 221 m^(2)`
Area not to be whitewashed = (area of 1 door) + (area of 2 windows)
`= (2 xx 1.5) m^(2) + (2 xx 1.5 xx 1) m^(2) = 6m^(2)`
Area to be whitewashed `= (221 - 6) m^(2) = 215 m^(2)`