AirQual Test Corporation provides on-site air quality testing services. The company has provided the following cost formulas and actual results for the month of February: The company uses the number of jobs as its measure of activity. For example, mobile lab operating expenses should be $4,800 plus $31 per job, and the actual mobile lab operating expenses for February were $9,290. The company expected to work 150 jobs in February, but actually worked 160 jobs. Required: Prepare a flexible budget performance report showing AlrQual Test Corporation's revenue and spending variances and activity variances for February. (Indicate the effect of each variance by selecting " F " for favorable, " U " for unfavorable, and "None" for no effect (i.e., zero variance). Input all amounts as positive values.)