Spartan Systems reported total sales of $371,800, at a price of $22 and per unit variable expenses of $10, for the sales of their single product. Total Per Unit Sales $ 371,800 $ 22 Variable expenses 169,000 10 Contribution margin 202,800 $ 12 Fixed expenses 125,000 Net operating income $ 77,800 What is the amount of contribution margin if sales volume increases by 25%? $21,125 $16,900 $253,500 $202,800