Spartan Systems reported total sales of $387,500, at a price of $25 and per unit variable expenses of $15, for the sales of their single product. Total Per Unit Sales $ 387,500 $ 25 Variable expenses 232,500 15 Contribution margin 155,000 $ 10 Fixed expenses 94,000 Net operating income $ 61,000 What is the amount of contribution margin if sales volume increases by 20%?