# A Swimming Pool Is 20M In Length, 15M In Breadth And 4M In-Depth. Find The Cost Of Painting Its Four Walls At The Rate Of Rs. 20 Per Square Metre.

Given:

Length = 20m

Height = 4m

The Area of floor = Length × Breadth

$$\Rightarrow 20 * 15$$ $$\Rightarrow 300 m^{2}$$

The Area of walls = 2 (Lh + Bh) $$cm^{2}$$ $$\Rightarrow 2 (20 × 4 + 15 × 4)$$ $$\Rightarrow 2 (80 + 60)$$ $$\Rightarrow 2 (140)$$ $$\Rightarrow 280 m^{2}$$

Sum of areas of floor and four walls = Area of floor + Area of walls

$$\Rightarrow 300 + 280$$ $$\Rightarrow 580 m^{2}$$

Given, Cost for repairing 1 $$m^{2} area = Rs 20$$

Therefore, the cost for repairing 580 $$m^{2}$$ $$\Rightarrow 580 * 20$$ $$\Rightarrow Rs 11600$$

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