Using the following information, compute Activity Variance. Revenue Variable costs Contribution margin Fixed costs Profit Master Budget Flexible budget | Actual Results $50,000 $53,000 $52,000 $20,000 $22,000 $21,500 $30,000 $31,000 $30,500 $7,000 $7,000 $6,000 $23,000 $24,000 $24,500 $1,000 Favorable O $1,000 Unfavorable $1,500 Unfavorable $1,500 Favorable