The volume \( V \) of a pyramid is calculated using the formula:
\[ V = \frac{1}{3} \times \text{Base Area} \times \text{Height} \]
In this case, the base is a rectangle with dimensions 15 m and 20 m. First, let's calculate the area of the base:
\[ \text{Base Area} = 15 , \text{m} \times 20 , \text{m} = 300 , \text{m}^2 \]
The height of the pyramid is given as 80 m. Now we can substitute the values into the volume formula:
\[ V = \frac{1}{3} \times 300 , \text{m}^2 \times 80 , \text{m} \]
\[ V = \frac{1}{3} \times 24000 , \text{m}^3 \]
\[ V = 8000 , \text{m}^3 \]
Therefore, the volume of the tower is 8,000 m³.