18.Contractor is constructing a building at a site and observed that a room measuring 5m×4m×3m in which elderly people are residing, is in a very bad condition. He decided to

renovate the room by plastering the inside and outside walls and then white washing the

outside walls and inside walls. The room has a door measuring 1.2m×2m and two windows

1.2 m×1.5m. The rate of plastering and white washing is ₹120 per sq. m and ₹45 per sq. m

respectively.

b. What is the area to be plastered?

c. What is the total cost of renovation?

d. Which mathematical concept is used in the above problem.

e. By renovating the room, What value is depicted by the contractor?​