Useful life Juniper Corporation is considering two alternative investment proposals with the following data: Proposal X Investment $860,000 9 years Estimated annual net cash inflows for 9 years $120,000 Residual value $36,000 Depreciation method Straight-line Required rate of return How long is the payback period for Proposal Y? Proposal Y $476,000 9 years $84,000 $- Straight-line 6% 14% O A 13.22 years OB 7.17 years OC 23.89 years OD 5.67 years