A door of length 2 m and breadth 1m is fitted in a wall. The length of thewall is 4.5 m and the breadth is 3.6 m (Fig11.6). Find the cost of white washing the wall, if the rate of white washing the wall is Rs 20 per m2.

Explanation

To solve the problem step by step, we will calculate the area of the wall, the area of the door, and then find the area that needs to be whitewashed. Finally, we will calculate the total cost of whitewashing the wall.

### Step 1: Calculate the area of the wall
The area of a rectangle is given by the formula:
\[ \text{Area} = \text{Length} \times \text{Breadth} \]

For the wall:
- Length = 4.5 m
...