Answer: $510,000
Step-by-step explanation:
Given that,
Earnings before depreciation and taxes = $630,000
Depreciation = $330,000
Tax bracket = 40%
Earnings before taxes = Earnings before depreciation and taxes - Depreciation
 = $630,000 - $330,000
 = $300,000
Therefore, taxes = 40% of $300,000 
 = $120,000
Earnings after taxes = Earnings before taxes - taxes
 = $300,000 - $120,000
 = $180,000
Cash flow = Earnings after taxes + Depreciation
 = $180,000 + $330,000
 = $510,000