Highfill Corporation's variable overhead is applied on the basis of direct labor-hours. The standard cost card for product D80D specifies 6.0 direct labor-hours per unit of D80D. The standard variable overhead rate is $6.20 per direct labor-hour. During the most recent month, 1,400 units of product D80D were made and 8,500 direct labor-hours were worked.

The actual variable overhead incurred was $55,290.

Required:

a. What was the variable overhead rate variance for the month?

b. What was the variable overhead efficiency variance for the month?