4. The internal dimensions of rectangular hall are 15 m x 12 m x 4 m. There are 4 windows  each of dimension 2 m x 1.5 m and 2 doors each of dimension 1.5 m x 2.5 m. Find the cost of white washing all four walls of the hall, if the cost of white washing is Rs. 5 per sq. m. What will be the cost of white washing if the ceiling of the hall is also white washed?