The cost formula for the maintenance department of Rainbow Ltd. is $19,200 per month plus $7.70 per machine hour used by the production department. Required: a. Calculate the maintenance cost that would be budgeted for a month in which 6,700 machine hours are planned to be used. Maintenance cost b. Prepare an appropriate performance report for the maintenance department assuming that 7,060 machine hours were actually used in the month of May and that the total maintenance cost incurred was $68,920. (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance).) Original Budget Flexed Budget (6,700 MH) (7,060 MH) Actual Cost Variance Total maintenance cost