What is the regular payback period for Black Swan company's new project if its initial after-tax cost is $5,000,000 and it is expected to provide after-tax operating cash inflows of $1,800,000 in year 1, $1,900,000 in year 2, $700,000 in year 3 and $1,800,000 in year 4 Oa None of the above. O b. 3.33 years Oc 4.33 years O d. 2.33 years