Suppose that you are the manager of a software development company that has been awarded a contract to develop an AI model. The developing process will last one year. The client asked you to choose of the following payment plans:

Plan B: Pay you the price of $142000$$ s

Plan C: Pay you the price of $155000$$ $$

Using a $9\%$ normal interest rate compounded monthly, which payment plan should you take

Suppose that you decided PlanB and found out later that project will cost you