Answer:
$74,069.9
Explanation:
The components of cash flow for year 4 of the projects are: 
+) the recovery of net working capital 
+) the annual operating cash flow
+) the value equipment can be sold
+) the tax payment 
As given:
+) The recovery of networking capital = $5,160
+) The annual operating cash flow = $52,620
+) The salvage value of equipment = $15,900
+) The tax the company has to pay is: 
<em>Tax payment = (Market value - Book value) x Tax rate = (15,900-17,014) x 0.35 = -389.9</em>
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The cash flow for year 4 = Annual operating cash flow + recovery of net working capital + salvage value of equipment - tax payment 
= 52,620 + 5,160 + 15,900 - (-389.9) = $74,069.9