Your company is considering two mutually exclusive projects, X and Y, whose costs and cash flows are shown below: Year 0 1 2 3 4 X ($1000) 100 300 400 700 Y ($1000) 1000 100 50 50 The projects are equally risky, and their cost of capital is 12 percent. Based on the payback period, what is your recommendation? What are the weaknesses of payback period method?