For example, adminlstrative expenses should be $3,800 per month plus $42 per course plus $3 per student. The company's sales should average $880 per student. The company planned to run four courses with a total of 60 students; however, It actually ran four courses with a total of only 54 students. The actual operating results for September were as follows: Required: Prepare a flexible budget performance report that shows both revenue and spending varlances and actlvity varlances for September. (Indlcate the effect of each varlance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (l.e., zero varlance). Input all amounts as positlve values.)