Payback (See calculation below) 0.00 Data for Payback Years 0 1 2 3 4 Net cash flow (12,400) 4,028 4,605 4,193 6,689 Cumulative CF (12,400) (8,372) (3,767) 425 7,115 Part of year required for payback 0.00 0.00 2.82 3.10 variable costs per unit, and number of units sold. Set these variables' values at 10% and 20% above and below their base- case values. Include a graph in your analysis