You have been tasked to analyze the firms decision to buy new printers and not renew the firms 10-year lease for all of the office printers. The cost of all the office printers is $4.2 million and the key benefit from this investment is the elimination of the fixed monthly lease payment associated with renewing the 10-year lease. When estimating the present value of the benefits, should you use the firms cost of debt (4%), the firms WACC (6%), or the average WACC from a set of pure play firms (Printer Firms; 7%)? Explain!