Predetermined Factory Overhead Rate devices), physician surgical time, and operating room overhead. On March 1 of the current year, the annual operating room overhead is estimated to be: two weeks per year for general and maintenance repairs. a. Determine the predetermined operating room overhead rate for the year. $ per hour b. Shirlee Greer had a 3.4-hour procedure on March 18. How much operating room overhead would be charged to her procedure, using the rate determined in part (a)? Feedback v Check My Work a. Determine the estimated annual operating room hours. Divide the estimated annual operating room overhead by the estimated hours. b. Multiply the predetermined rate by the hours of actual surgery. c. Multiply the predetermined rate by the actual hours. Compare the actual cost and the applied cost