me solve this problem. I don't just want the answer, I would like to know how to solve the problem. Thanks! "The Clark Company makes a single product and uses standard costing. Some data concerning this product for the month of May follow: Labor rate variance: $7,000 F Labor efficiency variance: $12,000 F Variable overhead efficiency variance: $4,000 F Number of units produced: 10,000 Standard labor rate per direct labor hour: $12 Standard variable overhead rate per direct labor hour:$4 Actual labor hours used: 14,000 Actual variable manufacturing overhead costs: $58,290 The total standard cost for variable overhead for May was: a. $56,000. b. $40,000. c. $60,000. d. $50,000