Predetermined Factory Overhead Rate and medical devices), physician surgical time, and operating room overhead. On January 1 of the current year, the annual operating room overhead is estimated to be: 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. Ebony Jones had a 7-hour procedure on January 22. How much operating room overhead would be charged to her procedure, using the rate determined in part (a)? c. During January, the operating room was used 194 hours. The actual overhead costs incurred for January were $53,100. Determine the overhead under- or overapplied for the period