please show work and formulas so I can check my work against yours.

Texas Roks, Inc. is considering a new quarry machine. The costs and revenues associated with the machine have been provided to you for analysis:

Cost of the new project	$4,000,000
Installation costs	$100,000
Estimated unit sales in year 1	50,000
Estimated unit sales in year 2	75,000
Estimated unit sales in year 3	40,000
Estimated sales price in year 1	$150
Estimated sales price in year 2	$175
Estimated sales price in year 3	$160
Variable cost per unit	$120
Annual fixed cost	$50,000
Additional working capital needed	$435,000
Depreciation method	3 years straight-line method, no salvage value
Texas Rok's tax rate	40%
Texas Rok's cost of capital	13%

Required:

Calculate operating cash flow and the change in net working capital.

Determine the NPV and IRR of the project.

Should the company accept or reject the project based on the NPV? Why?

Should the company accept or reject the project based on the IRR? Why?

What is your final accept or reject decision? Why?

What is the payback period for t