Lantto Air uses number of flights as the measure of activity, in the cost formulas in its budgets and performance reports. The cost formula for plane operating costs is $34,720 of fixed costs per month plus $2,800 per flight of variable costs. The company expected its activity in June to be 75 flights, but the actual activity was 78 flights. The plane operating costs in the flexible budget for June would be closest to: $253,280 $343,720 $253,120 $134,248