The information below is for Casey Corporation. Product sales: 1,000 units at $10 each Variable manufacturing costs: $5.50 per unit Fixed manufacturing overhead: $1,200 Variable selling and administrative costs: $.50 per unit sold Fixed selling and administrative costs: $1,000 No beginning inventory Units produced: 1,200 Caseys operating income under variable (direct) costing is A.$700 B.$2,300 C.$1,800 D.$600