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.
A green algae, Chlamydomonas reinhardtii, can produce hydrogen when temporarily deprived of sulfur for up to 2 days at a time. A small company needs to purchase equipment costing $3.4 million to commercialize the process. If the company wants to earn a rate of return of 10% per year and recover its investment in 8 years, what must be the net value of the hydrogen produced each year?