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Predetermined Factory Overhead Rate Mt Ellis Medical Center has a single operating room that is used by local physicians to perform surgical procedures. The cost of using the operating room is accumulated by each patient procedure and includes the direct materials costs (drugs and medical devices), physician surgical time, and operating room overhead. On March 1 of the current year, the annual operating room overhead is estimated to be: The overhead costs will be assigned to procedures based on the number of surgical room hours. Mt Ellis Medical Center expects to use the operating room an average of eight hours per day, seven days per week. In addition, the operating room will be shut down two weeks per year for general repairs. a. Determine the predetermined operating room overhead rate for the year. per hour b. Shirlee Greer had a 6-hour procedure on March 18. How much operating room overhead would be charged to her procedure, using the rate determined in part (a)? \$ c. During March, the operating room was used 194 hours. The actual overhead costs incurred for March were $64,500. Determine the overapplied operating overhead or underapplied operating overhead for the period