38 conference hall is 14 m long, 8 m wide and 4 m high. There are four windows and one door in it. The door measures 1 m by 2 m and each window measures 1 m by 1,5 m. (a) How many litres are required to paint the four walls of the hall if one litre paints 21 m²? What will be the cost of painting the four walls if 1 litre costs * 225? ​