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 $6,410 Fixed operating expenses 3,520 9,930 What is the amount of the contribution margin that would be reported on the variable costing income statement? Oa. $488,070 Ob. $590,070 Oc. $491,590 Od. $599,850