the length breadth and height of a room are 6m 4m and 3m respectively find the cost of white washing the four walls of the room ar the rate of rs 12 per meter square the room has an entrance door measuring 2.5m*1m which is not to be white washed ​

6 *4*3 = 72

Area to be painted = Lateral Surface Area - Area of door LSA = 2 (l+b)h = 2 (6+4)3 =60 meter square Area of door = l×b of door = 2.5×1 =2.5 meter square Area yo be painted = 60-2.5 =57.5 meter square Cost of painting @Rs12 per sq meter = 57.5×12 = Rs 690

thnaks a lot muhammad 

thanks parthkumar