Top managers of Stenback Industries predicted 2018 sales of 15,100 units of its product at a unit price of $7.50. Actual sales for the year were 14,000 units at $10.50 each. Variable costs were budgeted at $2.40 per unit, and actual variable costs were $2.50 per unit. Actual fixed costs of $44,000 exceeded budgeted fixed costs by $5,300. Prepare Stenback's flexible budget performance report. What variance contributed most to the year's favorable results? What caused this variance? Prepare a flexible budget performance report for the year. First, complete the flexible budget performance report through the contribution margin line, then complete the report through the operating income line. Finally, compute the total variances. (Enter a "0" for any zero balances. For any $0 variances, leave the Favorable (F)/Unfavorable (U) input blank.) Stenback Industries Flexible Budget Performance Report For the Year Ended December 31, 2018 Units Sales Revenue Variable Costs Contribution Margin 1 2 3 5 (1)-(3) (5) Budget Flexible Sales Amounts Actual Budget Per Unit Results Variance Flexible Budget Volume Variance Static Budget