corporation has provided the following production and average cost data for two levels of production volume. the company produces a single product. production volume.... 4000 units 5000 units direct materials $45.50 per unit 45.50 per unit direct labor 44.90 per unit 44.90 per unit Manufacturing overhead 131.50 per unit 108.50 per uni the best estimate of the total variable manufacturing cost per unit is: 16.50 90.40 45.50 106.90