Revenue: $1000 COGS: $200 SG&A: $150 R&D: $50 Traffic accident expenses (fix trucks, paying fines, etc.); $100 Interest expenses: $100 Tax expenses: $100 What is the firm's net profit margin? 50% O 60% 30% 40% 43 # 8: di *: E D 54 4 R F % 5 5 #tv T MacBook Air