To find the volume of a rectangular pyramid, we use the formula:
\[ \text{Volume} = \frac{1}{3} \times \text{Base Area} \times \text{Height} \]
First, we need to calculate the base area of the pyramid. The base is a rectangle, so the area can be found using:
\[ \text{Base Area} = \text{Length} \times \text{Width} = 15 , \text{m} \times 20 , \text{m} = 300 , \text{m}^2 \]
Next, we substitute the base area and height into the volume formula. The height of the pyramid is given as 80 m.
\[ \text{Volume} = \frac{1}{3} \times 300 , \text{m}^2 \times 80 , \text{m} \]
Calculating this gives:
\[ \text{Volume} = \frac{1}{3} \times 300 \times 80 = \frac{1}{3} \times 24000 = 8000 , \text{m}^3 \]
Therefore, the volume of the tower is \(8000 , \text{m}^3\).
The correct answer is 8,000 m cubed.