Due to erratic sales of its sole product-a high-capacity battery for laptop computers-PEM, Inc., has been experiencing financial difficulty for some time. The company's contribution format income statement for the most recent month is given below: Sales (12, 600 units X $30 per unit) Variable expenses Contribution margin Fixed expenses Net operating loss 378, 000 226,800 151, 200 169,200 $ (18, 000)