4. Based on a 3% discount rate, what is the 2013 present value of the costs of the three alternatives estimated to accrue over the next 4 years? Assume that costs are assessed (accrued) at the beginning of the year Year Alternative 1 estimated costs ($) 10,000 30,00030,000 20,000 Alternative 2 estimated costs ($) 15,000 15,000 25,000 25,000 2013 2014 2015 2016 Allemotive 3 estinated cosis ($)s 20,000 20,000ad 20,000 20,000