A business operated at 100% of capacity during its first month, with the following results: Sales (120 units) $600,000 Production costs (150 units): Direct materials $75,000 Direct labor 18,750 Variable factory overhead 33,750 Fixed factory overhead 30,000 $157,500 Operating expenses: Variable operating expenses $5,470 Fixed operating expenses 3,120 8,590 The amount of operating income that would be reported on the variable costing income statement is Oa. $599,850 Ob. $459,410 Oc. $492,530 Od. $591,410