Answer:
The mechanic spent 12 hours on the repair.
Explanation:
- $595-$55=£540. £540 is the total of the amount the mechanic charges for an hour, MINUS the computer diagnostic test
- To find out how many hours the mechanic spent on the repair, we have to do $540 divided by $45, which is 12.
The mechanic spent 12 hours on the repair.