Trevorrow Corporation manufactures and sells a single product. The company uses units as the measure of activity in its budgets and performance reports. During June, the company budgeted for 5,200 units, but its actual level of activity was 5,160 units. The company has provided the following data concerning the formulas used in its budgeting and its actual results for June: Data used in budgeting: Fixed Variable element element per per month unit $30.20 Revenue Direct labor Direct materials Manufacturing overhead Selling and administrative expenses Total expenses $ 0 0 38,300 23,900 $62,200 $ 3.20 11.00 1.30 0.30 $15.80 Actual results for June: Revenue $159, 252 Direct labor $ 15,989 Direct materials $ 54,525 Manufacturing overhead $ 44,928 Selling and administrative expenses $ 25,528 The activity variance for net operating income in June would be closest to