20. The following information pertains to Stone Wall Corporation: Beginning fixed manufacturing overhead in inventory $70,000 Ending fixed manufacturing overhead in inventory 49,000 Beginning variable manufacturing overhead in inventory $34,000 Ending variable manufacturing overhead in inventory 18,000 Fixed selling and administrative costs $740,000 Units produced 5,000 units Units sold 4,300 units What is the difference between operating incomes under absorption costing and variable costing