(Ignore income taxes in this problem.) Jimba's, Inc., has purchased a new donut maker. It cost $20,000 and has an estimated life of 10 years. The following annual donut sales and expenses are projected: $30,000 Sales Expenses: Flour, etc., required in making donuts Salaries Depreciation Net operating income $15,000 8,000 2,000 25,000 $5,000 Assume cash flows occur uniformly throughout a year except for the initial investment. The payback period on the new machine is closest to: O 2.9 years O 4.3 years O 4.0 years O 6.0 years