Microeconomics question about marginal revenue and marginal cost?

Question

A bank has decided to turn its parking lot into an after hours pay lot. The bank is currently charging $10 per car to park in the lot and the are 100 spaces. The employee is paid $10/hour. What is the marginal revenue and marginal cost for each additional car that pays to use the bank's parking lot?

Answer 1

Discussions about marginal costs and marginal profit can get as philosophical as discussions about fixed and variable costs.
If the employee is hired at the beginning of the project for a fixed amount of hours, then his cost in no longer marginal. Thus, the marginal cost of the parking lot would be US$0 and the marginal revenue would be US$10 multiplied by the number of hours that the car uses the parking lot.