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Determine the formula that is used to calculate the production-volume variance. (Abbreviation used: mfg = manufacturing.) Data table Requirements 1. Calculate the inventoriable cost per unit using each level of capacity to compute fixed manufacturing cost per unit. 2. Suppose PLF actually produces 250,000 bulbs. Calculate the production-volume variance using each level of capacity to compute the fixed manufacturing overhead allocation rate. 3. Assume PLF has no beginning inventory. If this year's actual sales are 212,500 bulbs (and production is 250,000 bulbs), calculate operating income for PLF using each type of capacity to compute fixed manufacturing cost per unit. Determine the formula that is used to calculate the production-volume variance. (Abbreviation used: mfg = manufacturing.) Data table Requirements 1. Calculate the inventoriable cost per unit using each level of capacity to compute fixed manufacturing cost per unit. 2. Suppose PLF actually produces 250,000 bulbs. Calculate the production-volume variance using each level of capacity to compute the fixed manufacturing overhead allocation rate. 3. Assume PLF has no beginning inventory. If this year's actual sales are 212,500 bulbs (and production is 250,000 bulbs), calculate operating income for PLF using each type of capacity to compute fixed manufacturing cost per unit