Bob's Lock and Key is a locksmith operation which replaces automobile ignitions on the highway. Bob's average cost per ignition is $140 and charges $320 to the client for the replacement. The cost to keep a locksmith truck on the road is $200,000/year. Bob wants to earn a profit of $125,000/year. How many ignitions must Bob replace to generate this profit?

Question 20 options:

1800-1900

650-750

850-950

1100-1200