15.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, $1,900,000 in year 2, $700,000 in year 3, and $1,800,000 in year 4? a. 4.33 years b. 3.33 years c. 2.33 years d. None of the above 16.Thealue a. book value b. market value is the firm's desired optimal mix of debt and equity financing. c. cost of capital d. target capital structure