plz help

A business is considering two alternative investment proposals with the following data: Proposal A $800,000 Proposal B $400,000 Investment Useful life 6 years 8 years Estimated annual net cash inflows Residual value $175,000 $75,000 $40,000 $10,000 Straight-line Straight-line Depreciation method How long is the payback period for Proposal A? Oa.7 years Ob. 6 years Oc. 6.5 years Od.4.57 years How long is the payback period for Proposal B? Oa. 5 years Ob. 5.33 years Oc. 6.5 years Od.9.75 years What is the accounting rate of return for Proposal A? Oa.6.36% Ob.15% Oc.27.27% Od.3.68% What is the accounting rate of return for Proposal B? Oa. 8.5% Ob.20% Oc.7.5% Od.6.73%