Madengrad Company manufactures a single electronic product called Precisionmix. This unit is a batch-density monitoring device attached to large industrial mixing machines used in flour, rubber, petroleum, and chemical manufacturing. Precisionmix sells for $900 per unit. The following variable costs are incurred to produce each Precisionmix device: Direct labor Direct materials Factory overhead Variable production costs Marketing costs Total variable costs $180 240 105 $525 75 $600 Madengrad's income tax rate is 40%, and annual fixed costs are $6,600,000. Except for an operating loss incurred in the year of incorporation, the firm has been profitable over the last 5 years. Assume a 10% increase in annual fixed costs, a 20% unit cost increase for direct labor, and a reduction in unit material costs of 25%, with no change in selling price. After incorporating these changes, Madengrad Company's contribution margin would be O A. 69% O B. 34% C. 64% OD. 36% 4