The Regal Baking Company is considering the expansion of its business into door-to-door delivery service. This would require an additional $12,500 in labor costs per month. Company-owned vehicles now used to make morning deliveries to restaurants could be used in the afternoon to make the home deliveries. However, it is estimated that an additional $5,000 would be required per month for gas, oil, and maintenance. It is futher estimated that the home delivery use of the trucks would be allocated 45% of the existing $6,500 fixed vehicle costs. What is the differential delivery cost per month for expanding into the home delivery market? a. $12,500 b. $17,500 c. $19,750 d. $20,425