Tustin corporation has provided the following data for its two most recent years of operation: selling price per unit $ 68manufacturing costs: variable manufacturing cost per unit produced: direct materials $ 10direct labor $ 6variable manufacturing overhead $ 4fixed manufacturing overhead per year $ 220,000selling and administrative expenses: variable selling and administrative expense per unit sold $ 6fixed selling and administrative expense per year $ 61,000year 1 year 2units in beginning inventory 0 1,000units produced during the year 11,000 10,000units sold during the year 10,000 7,000units in ending inventory 1,000 4,000the net operating income (loss) under variable costing in year 1 is closest to: multiple choicea. $480,000b. $139,000c. $420,000d. $159,000