. Rock Haven has a proposed project that will generate sales of 1,680 units annually at a selling price of $22 each. The fixed costs are $12,700 and the variable costs per unit are $5.95. The project requires $28,000 of fixed assets that will be depreciated on a straight-line basis to a zero book value over the 4-year life of the project. The salvage value of the fixed assets is $6,900 and the tax rate is 34 percent. What is the operating cash flow for year four?