Can I get an explanation on the following question?

You are considering a 3-year project of which details are summarized below.Your required rate of return for capital budgeting purposes is 20 percent.

• Annual sales = 30,000 units
• Unit sales price = $5.00
• Variable costs = $2.50 per unit
• Annual fixed costs = $18,000
• Initial capital investment = $72,000, depreciated to zero over 3 years
• Initial investment in working capital = $20,000, fully recovered at the end of the project
• The tax rate is 25%.

1. What is the project's cash flow in year 3?