A door of length `2` `m` and breadth `1` `m` is fitted in a wall. The length of the wall is `4.5` `m` and the breadth is `3.6` `m`. Find the cost of white washing the wall, if the rate of white washing the wall is `Rs` `20` per `m^2`.

Explanation

To solve the problem step by step, we will calculate the area of the wall, subtract the area of the door, and then find the cost of whitewashing the remaining area.

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

Given:
- Length of the wall = 4.5 m
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