Acme Cоmpаny uses а stаndard cоst accоunting system. During the current year, Acme produces 4,000 units of finished goods, actual direct labor hours are 8,500 hours, and actual direct labor costs are $136,000. The direct labor spending variance is $1,650 favorable and the direct labor efficiency variance is $9,400 unfavorable. What is the standard direct labor rate per hour?