Question

a wall has a door of length 1.32 and breath 0.75 meter the length of the wall of 0.5 and breath the is 4.2 m find the cost of white washing the wall if the rate of white washing the wall is rupees 20 per square m

Answer 1

what is the unit of the length of wall and door.

Answer 2

area to be white washed = area of wall - area of door
                                        = 0.5*4.2 - 1.32*0.75
                                        = 2.1 - 0.3
                                        = 1.8 m^2
cost of white washing = 20*1.8
                                   = Rs 36