Highfill Corporation's variable overhead is applied on the basis of direct labor-hours. The standard cost card for product D80D specifies 6.1 direct labor-hours per unit of D80D. The standard variable overhead rate is $6.30 per direct labor-hour. During the most recent month, 1,500 units of product D80D were made and 9,200 direct labor-hours were worked. The actual variable overhead incurred was $61,580. Required: a. What was the variable overhead rate variance for the month