Preble Company manufactures one product. Its variable manufacturing overhead is applied to production based on direct labor-hours and its standard cost card per unit is as follows: Direct material: 4 pounds at $9.00 per pound $ 36.00 Direct labor: 3 hours at $12 per hour 36.00 Variable overhead: 3 hours at $8 per hour 24.00 Total standard variable cost per unit $ 96.00 The company also established the following cost formulas for its selling expenses: