Example && The internal measures of a cuboidal room are 12mx8mx 4 m. Find thetotal cost of whitewashing all four walls of a room, if the cost of white washing is 5 perm2. What will be the cost of white washing if the ceiling of the room is also whitewashed.

Example && The internal measures of a cuboidal room are 12mx8mx 4 m. F

1.	Example && The internal measures of a cuboidal room are 12mx8mx 4 m. Find thetotal cost of whitewashing all four walls of a room, if the cost of white washing is 5 perm2. What will be the cost of white washing if the ceiling of the room is also whitewashed.
Answer» 2(l+b)h = LSA2(12+8)4 =2(20)4 = 404 = 160m²cost of whitewashing 4 walls =1605 = Rs 800area of 5 walls = LSA+ lb = 160 + (128) = 160 + 96 = 256m²cost of whitewashing vd ceiling = Rs 800 +(96*5) = Rs 800 + 480 = Rs 1280