Evan needed to get his computer fixed. He took it to the repair store. The technician at the store worked on the computer for 4.5 hours and charged him $97 for parts. The total was $479.50. What was the cost of labor, per hour?
The cost of labor is the total cost minus the cost of parts: $479.50 - $97 = $<<479.5-97=382.50>>382.50
The cost of labor per hour is therefore $382.50 / 4.5 hours = $<<382.5/4.5=85>>85 per hour. Answer: \boxed{85}.