A room is 8 m long, 6 m wide and 3.5 m high. It has one door 2 m by 1 m and two windows each 1.5 m by 1 m. The four walls and the ceiling are to be painted at ₹25 per m². What will the painting cost?

Explanation

1. 01

   Four walls = $2 \times (8 + 6) \times 3.5 = 98$ m². Ceiling = $8 \times 6 = 48$ m².

2. 02

   Door and windows = $2 \times 1 + 2 \times 1.5 \times 1 = 5$ m².

3. 03

   Area to paint = $98 + 48 - 5 = 141$ m².

4. 04

   Cost = 141 × ₹25 = ₹3,525.