Answer:
One-time set up fee cost = $45
Explanation:
Given:
Cost for 5 hours = $235
Cost for 12 hours = $501
Find:
One-time set up fee cost
Computation:
One-time set up fee cost = x
Hourly cost = y
So,
For 5 hour
x + 5y = 235 ......eq1
For 12 hour
x + 12y = 501 ......eq2
From eq 1 and eq 2
x = 45
So,
One-time set up fee cost = $45