Identify the four engineering economy symbols and their values from the following problem statement.
Use a question mark with the symbol whose value is to be determined.
Thompson Mechanical Products is planning to set aside $150,000 now for possibly replacing its large synchronous refiner motors whenever it becomes necessary. If the replacement is not needed for 7 years, how much will the company have in its investment set-aside account, provided it achieves a rate of return of 11% per year?