Correct Answer - Option 2 : 9.36 sq.m

__Concept:__

**For a wall of given length ‘L’ and height ‘H’**

Area of wall = L × H

**Area of the wall to be painted = (Area of a wall) – (Area of ventilation)**

Where an area of ventilation may include the **area of doors and windows**

**For the window of length ‘l’ and height ‘h’**

Area of ventilation = l × h

__Calculation:__

Given,

L = 3000 mm = 3 m, H = 3200 mm = 3.2 m

l = 600 mm = 0.6 m, h = 400 mm = 0.4 m

Area of wall = L × H = 3 × 3.2 = 9.6 m^{2}

Area of ventilation = l × h = 0.6 × 0.4 = 0.24 m^{2}

**∴**** Area of the wall to be painted = (Area of a wall) – (Area of ventilation)**

∴ Area of the wall to be painted = (9.6) – (0.24) = 9.36 m^{2}

**Hence the area of the wall to be painted = 9.36 sq.m**