What is the operating cash flows of the project, please explain the formula if the firm's tax bracket is 40%?

Laurel's Lawn Care, has a new mower line that can generate revenues of $123,000 per year. Direct production costs are $41,000, and the fixed costs of maintaining the lawn mower factory are $15,500 a year. The factory originally cost $0.82 million and is being depreciated for tax purposes over 20 years using straight-line depreciation.