Answer:
The cost of installing the chain link fence is given as $180 for 20 feet. This implies that the cost per foot of the fence is $$\frac{180}{20} = 9$$ dollars.
Therefore, the cost to install 300 feet of the fence would be $$300 \times 9 = 2700$$ dollars. So, it would cost **$2700** to install 300 feet of the chain link fence.