Required information [The following information applies to the questions displayed below.] Monterey Co. makes and sells a single product. The current selling price is $14 per unit. Variable expenses are $8.4 per unit, and fixed expenses total $30,560 per month. (Unless otherwise stated, consider each requirement separately.) C. Calculate the monthly operating income (or loss) at a sales volume of 5,100 units per month. (Do not round intermediate calculations.)