The incubation period averages 8-12 hours, after which diarrhea and abdominal cramps begin. C. perfringens symptoms usually persist for one day. A severe complication, necrotic enteritis (also known as pig-bel syndrome), can develop if large numbers of bacteria are ingested.
Variable costing is a costing system under which those costs of production that vary with output are treated as product costs. This would usually include direct materials, direct labor and variable portion of manufacturing overhead. Fixed manufacturing cost is not treated as a product costs under variable costing.
Under absorption costing, the cost per unit can be calculated as follows: $10 (direct materials) + $8 (direct labor) + $2 (variable manufacturing costs) + $4 ($40,000 per year in fixed manufacturing overhead costs divided by 10,000 units) = $24 per unit. Absorption costing and activity-based costing differ in approach.