The Gourmand Cooking School runs short cooking courses at its small campus. Management has identified two cost drivers it uses in its budgeting and performance reports-the number of courses and the total number of students. For example, the school might run two courses in a month and have a total of 63 students enrolled in those two courses. Data concerning the company's cost formulas appear below: For example, administrative expenses should be $3,900 per month plus $40 per course plus $6 per student. The company's sales should average $880 per student. The company planned to run four courses with a total of 63 students; however, it actually ran four courses with a total of only 61 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 activity variances for September: (indicate the effect of each variance by selecting "F" for favorable, " U " for unfavorable, and "None" for no effect (le., zero variance). Input all amounts as positive values.)