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: 5 pounds at $8.00 per pound $ 40.00 Direct labor: 3 hours at $15 per hour 45.00 Variable overhead: 3 hours at $9 per hour 27.00 Total standard variable cost per unit $ 112.00 The company also established the following cost formulas for its selling expenses