Question

Find the total cost of white washing the 4 walls of a cuboidal room ..... What will be the formula

Answer 1

First we have to take out the four walls area ie= 2(l+b)h [ here,l=length, b=breadth and h = height]

After that we have to multiply the four wall which has been taken out by the with the cost of painting ( like=₹20 per m^2)