CUB AIRLINES flies passengers between Bryan and Houston. It prices its tickets at two levels: First class and Coach. The following data provide forecasted and actual operating data for its flights: Forecasted revenue at forecasted level of activity$500 Forecasted variable costs at forecasted level of activity.350 Forecasted revenue at actual level of activity. Forecasted variable costs at actual level of activity....................-360 Actual revenue Actual variable costs " 700 450 Required: Calculate the following variances and indicate whether each is favorable (Fl or unfavorable [UJ 1. The sales volume variance 2 The sales mix variance 3. The sales price variance 4. The variable expense variance F U F U F U F U