Schister Systems uses the following data in its Cost-Volume- Profit analyses: Total Sales $ 400,000 Variable expenses Contribution margin 280,000 120,000 Fixed expenses 100,000 Net operating income $ 20,000 What is total contribution margin if sales volume increases by 20%? A) $80,000 B) $158,400 C) $200,000 D) $144,000 Anem