A business operated at 100% of capacity during its first month, with the following results: $600,000 Sales (120 units) Production costs (150 units): Direct materials $75,000 Direct labor 18,750 Variable factory overhead Fixed factory overhead 33,750 30,000 157,500 Operating expenses: Variable operating expenses Fixed operating expenses $5,160 4,410 9,570 What is the amount of the contribution margin that would be reported on the variable costing income statement? O a. $488,430 Ob. $492,840 c. $599,850 Od. $590,430