Required information [The following information applies to the questions displayed below.] Monterey Co. makes and sells a single product. The current selling price is $15 per unit. Variable expenses are $9 per unit, and fixed expenses total $27,000 per month. (Unless otherwise stated, consider each requirement separately.) d. Calculate monthly operating income (or loss) If a $2 per unit reduction in selling price results in a volume increase to 8,400 units per month. Operating income