To model the situation, we can define the following variables:
- \( C \): Total cost of the event
- \( t \): Number of tickets sold, which in this case will be the number of students and teachers attending (60).
The total cost can be represented by the equation:
\[ C = 500 + 20t \]
Here, \( 500 \) represents the fixed cost of the bus rental, and \( 20t \) represents the total cost for the tickets where each ticket costs $20.
If 60 students and teachers plan to attend, we can substitute \( t = 60 \) into the equation:
\[ C = 500 + 20(60) \] \[ C = 500 + 1200 \] \[ C = 1700 \]
So, the total cost for the event is $1,700.
The correct representation of the equation with total cost is:
\( C = 500 + 20t \) and the total cost if 60 attend is $1,700.