Cash Flows ($ mln) Projects Alpha Beta Gamma Delta CF -12.55 -8.25 -6.25 -24.95 CF1 4.75 3.85 0 0 CF2 4.75 4.75 0 0 CF3 4.75 4.95 0 0 CF4 4.75 0 12.75 43.95 Popcorn Corp. is considering the above four mutually exclusive projects. The firm has a marginal tax rate of 25%, an average tax rate of 17.5% and a WACC of 7.25%. Project Beta has a payback period of years and a discounted payback period of years