What is the payback period for Tangshan Mining 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, $1,300,000 in year 2, $700,000 in year 3, and $1,800,000 in year 4? a. 3.67 years b. 1.33 years C 3.33 years Od. 2.33 years