ABN Corp. has the following information about its standards and production activity in May: $55,000 40,000 Total factory overhead costs incurred: Variable overhead Fixed overhead Standard factory overhead rate: Variable overhead Fixed overhead Denominator activity level (in units) Actual units produced $ 4.00 per unit 3.40 per unit 13,700 14,000 Required: Calculate and show underlying calculations for each of the following variances: 1. Variable overhead flexible-budget (FB) variance, to the nearest whole dollar. 2. Fixed overhead spending variance, to the nearest whole dollar. 3. Fixed overhead production volume variance, to the nearest whole dollar. 4. Provide a short discussion/interpretation of each of the above-three variances