Rocco Manufacturing is considering following two investment proposals: Proposal X Proposal Y Investment $728,000 $516,000 Useful life 5 years 4 years Estimated annual net cash inflows received at the end of each year $168,000 $92,000 Residual value $66,000 SO Depreciation method Straight-line Straight-line Annual discount rate 10% 9% Present value of an ordinary annuity of $1: 8% 9% 10% 1 0 .926 0.917 0.909 O A. $677,874 O B. $657 293 O C. $636,888 OD. $831,421