An electrician charges $75 as a one-time fee plus an additional $45 per hour. If the total bill is $131.25, how many
hours did it take for the electrician to complete the repair?
Let's start by subtracting the one-time fee of $75 from the total bill to find out how much of the bill is due to the per hour charge: $131.25 - $75 = $<<131.25-75=56.25>>56.25.
Now we can divide the remaining amount by the hourly rate to find how many hours were worked on the repair: $56.25 / $45 = 1.25 hours. Answer: \boxed{1.25}.