During 2005 Rafael Corp produced 40,000 units and sold 30,000 units for $12 per unit. Variable manufacturing costs were $4 per unit. Annual fixed manufacturing overhead was $80,000 ($2 per unit). Variable selling and administrative costs were $1 per unit sold, and fixed selling and administrative expenses were $10,000. Prepare an absorption costing income statement and reconcile the difference between net income under variable costing and net income under absorption costing. that is, show a calculation that explains what causes the difference in net income between the two approaches