A swimming pool is `20 m` in length, `15 m` in breadth, and `4m` in depth. Find the cost of cementing its floor and walls at the rate of `R sdot12` per square metre.

Explanation

To solve the problem of finding the cost of cementing the floor and walls of a swimming pool in the shape of a cuboid, we will follow these steps:

### Step 1: Identify the dimensions of the swimming pool.
- Length (L) = 20 m
- Breadth (B) = 15 m
- Depth (H) = 4 m

### Step 2: Calculate the surface area of the walls.
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