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 $5,790 Fixed operating expenses 4,460 10,250 The amount of operating income that would be reported on the variable costing income statement is Oa. $599,850 Ob. $589,750 Oc. $457,750 Od. $492,210