Answer:
$67,440
Step-by-step explanation:
Year 4 cash flow = operating cash flow + terminal year cash flow
terminal year cash flow = sales price of the machine + net working capital - tax(sales price - book value)
6000 + 4800 - 0.4(6000 - 5100) = $10,400
Year 4 cash flow = $10,400 + $57,000 = $67,400