Using the following information, compute Activity Variance. $49,500 Revenue Variable costs Contribution margin Fixed costs Profit Master Budget Flexible budget Actual Results $51,000 $50,000 $20,000 $22,000 $23,000 $31,000 $28,000 $26,500 $7,000 $7,000 $6,000 $24,000 $21,000 $20,500 $3,500 Favorable O $3,000 Unfavorable $3,000 Favorable $3,500 Unfavorable