Imperial Industries has one product. Information about the production and sales of that product for the past year follow. $($Click the icon to view the data.$)$ The company had no beginning inventory. Read the requirements. Requirements $1.$ Prepare two income statements for the year, one using absorption costing and one using variable costing. Use those statements to answer the following questions: a$.$ What is the product cost per unit using absorption costing? b$.$ What is the product cost per unit using variable costing? c$.$ What is the ending inventory balance using absorption costing? d$.$ What is the ending inventory balance using variable costing? e$.$ What is cost of goods sold using absorption costing? f$.$ What is cost of goods sold using variable costing? g$.$ What is operating income using absorption costing? h$.$ What is operating income using variable costing? $2.$ What is the underlying reason for the difference in operating income between the two costing methods?