The following information pertains to SeaSpan Inc for a period: Selling price per unit Standard fixed manufacturing costs per unit Variable selling and administrative cost $41 $20 $4 per unit $16,000 Fixed selling and administrative costs Beginning inventories: Units Standard fixed manufacturing cost Standard variable manufacturing cost Units produced Units sold ? $40,000 $20,000 10,000 units 9,600 units a) Assume the unit standard costs data for the beginning and ending inventories remained constant during the period. What was the total standard cost of the ending inventory under absorption costing? b) Ignoring the effects of income taxes, what is your best estimate of the difference in retained earnings at the end of the period under absorption costing and variable costing