McCullough Regional Medical Centre uses a job-order costing system to assign costs to its patients. Its direct materials include a variety of items such as pharmaceutical drugs, heart valves, artificial hips, and pacemakers. Its direct labour costs (e.g., surgeons, anesthesiologists, radiologists, and nurses) associated with specific surgical procedures and tests are traced to individual patients. All other costs, such as depreciation of medical equipment, insurance, utilities, incidental medical supplies, and the labour costs associated with around-the-clock monitoring of patients are treated as overhead costs. Historically, McCullough has used one predetermined overhead rate based on the number of patient-days (each night that a patient spends in the hospital counts as one patient-day) to allocate overhead costs to patients. Recently a member of the hospital's accounting staff has suggested using two predetermined overhead rates (allocated based on the number of patient-days) to improve the accuracy of the costs allocated to patients. The first overhead rate would include all overhead costs within the Intensive Care Unit (ICU) and the second overhead rate would include all Other overhead costs. Information pertaining to the hospital's estimated number of patient-days, its estimated overhead costs, and two of its patients-Patient A and Patient B-is provided below: ICU Other Estimated number of patient-days 2, 020 19,970 Estimated fixed overhead cost $ 3, 374,090 $ 11, 620, 250 Estimated variable overhead cost per patient -day 260 80 Patient A Patient B Direct materials $ 4, 640 $ 5,490 Direct labour $20, 110 $42, 930 Total number of patient days (including ICU) Number of patient days spent in ICU