Heston Pigments manufactures artist's oil paints. Each 40 ml tube of paint requires 5 minutes of direct labor, and the standard labor rate is $8.10 per direct labor hour. In September, Heston incurred 11, 550 direct labor hours at a cost of $91, 000 to produce 146, 500 tubes of paint. Calculate Heston's direct labor rate variance for September. (Round answer to 0 decimal places, e.g. 125. If variance is zero, select "Not Applicable" and enter 0 for the amounts.) Direct labor rate variance $