The room has four walls to be painted
Area of these walls = 2(l x h) + 2(b x h)
= (2 x 14 x 6.5) + (2 x 10 x 6.5)
= 312m2
Now,
Area of the two doors = (2 x 2.5 x 1.2) = 6 m2
Area of the four windows = (4 x 1.5 x 1) = 6 m2
The walls have to be painted; the doors and windows are not to be painted.
∴ Total area to be painted = 312 - (6 + 6) = 300 m2
Cost for painting 1 m2 = Rs 35
Cost for painting 300 m2 = 300 x 35 = Rs 10,500