(2) Area of the four walls = 2h(l + b) = (2 × 4)(3 + 5) = 64 m2 ∵ There are doors and windows on the wall, therefore, area of the walls to be painted = Total area of walls – total area of doors and buildings = [64 – 2(3 × 2) – 4(1 × 2)] m2 = 44 m2 ∴ Total cost of painting = 44 × 32= ₹ 1408