value: 3.60 points TipTop Flight School offers flying lessons at a small municipal airport. The school's owner and manager has been attempting to evaluate performance and control costs using a variance report that compares the planning budget to actual results. A recent variance report appears below TipTop Flight School Variance Report For the Month Ended July 31 Planning Actual Results Budget Variances Lessons Revenue Expenses 195 39,880 190 38,950 930 F Instructor wages Aircraft depreciation Fuel Maintenance Ground facility expenses Administration 12,520 7,605 4,100 2,870 2,135 4,285 33,515 12,350 7,410 3,610 2,740 2,220 4,380 32,710 170 U 195 U 490 U 130 U 85 F 805 U Total expense Net operating income S 6,365 6,240 S 125 F After several months of using such variance reports, the owner has become frustrated. For example, she is quite confident that instructor wages were very tightly controlled in July, but the report shows an unfavorable variance. The planning budget was developed using the following formulas, where g is the number of lessons sold