The graph below shows monthly data collected on facilities maintenance department costs and on the number of patient-days serviced over the past year. 50,000 45,000 Maintenance Department Costs 40,000 35,000 30,000 25,000 20,000 15,000 10,000 5,000 Line of Best Fit 1,000 2,000 3,000 4,000 5,000 6,000 # of Patient-Days Using 0 and 3,000 patient-days, the total cost at an activity level of 8,000 customer patient-days would be: a. $91,000 O b. $66,860 c. $63,360 d. $55,000