Mark Mark If the discounted payback period of a project with normal cash-flows (f.e. cash outfiows at t=0 followed with series of cash inflows in the subsequent periods) is greater than its lifespan, then its profitability index is: O a less than zero Ob. equals one OC. greater than one O d. Profitability index cannot be inferred from the discounted payback period. Hence Insufficient information e. less than one