6. Luke, Inc., has a standard variable overhead rate of $5 per machine hour, with each completed unit expected to take three machine hours to produce. A review of the company's accounting records found the following: Actual production: 19,500 units Variable-overhead efficiency variance: $9,000U Variable-overhead spending variance: $21,000F What was Luke's actual variable overhead during the period? A. $262,500. B. $280,500. C. $304,500. D. $322,500. E. Some other amount