I'm having trouble answering these four questions Use the following to answer questions 8- 11: Selling price per unit $ 100 Variable expenses per unit $ 40 Fixed expenses per month $60,000 8. Operating income at a volume of 4,000 units per month is: A) $240,000 B) $200,000 C) $180,000 D) $120,000 The break-even point volume of units is: A) 0 B) 360 C) 720 D) 1000 10. The break-even point in terms of total revenues per month is: A) $30,000 B) $60,000 C) $75,000 D) $100,000 The contribution margin ratio is: A) 40% B) 60% C) 62.5% D) 70%