Piper Corporation's flexible budget cost formula for maintenance, a mixed cost, is $3,500 + $0.3X, where X is machine-hours. The company reported a $250 favorable spending variance for maintance in February. The company had originally planned to work for 10,000 machine-hours but ended up working for 10,500 machine-hours during the month. What was the actual costs incurred for maintenance in February? Multiple Choice $6,750 $6,400 $6,250 All of the other answers are incorrect