A project manager needs a car 3 days per week.
The daily cost of car renting is $200.
To purchase the car, it costs $26,000, and the daily car expenses are $50.

What should the project manager do if the project lasts 52 weeks?

The car is used in a toxic environment. If it is used for 6 months it is economically salvageable. If it is used for the whole year it is economically infeasible to clean it, so the vehicle is effectively worthless.