4. Below is operating information of Weber Light Aircraft, a company that produces light recreational aircraft. Per Aircraft Per Month Selling price Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Variable selling and administrative expense Fixed selling and administrative expense $ 1 00,000 $19,000 $5,000 $1,000 $70,000 $10,000 $20,000 January February March Beginning inventory Units produced Units sold Ending inventory 1. Assume that the company uses variable costing: a. Compute the unit product cost. b. Prepare an income statement for January, February and March. 2. Assume that the company uses absorption costing: a. Compute the unit product cost. b. Prepare an income statement for January, February and March