Answer:
a. Â $149.00
b. Â $217.00
Explanation:
Variable Costing
Product Cost under Variable Costing = Variable Manufacturing Costs Only
Total Variable Manufacturing Cost = $610,900
Unit Cost = Total Cost / Units Manufactured
        = $610,900 / 4,100 units
        = $149.00
Variable Costing
Product Cost under Absorption Costing = Variable Manufacturing Costs + Fixed Manufacturing Costs.
Total Absorption Cost Calculation
Total Variable Manufacturing Cost  $610,900
Fixed manufacturing costs        $278,800
Total Absorption Cost            $889,700
Unit Cost = Total Cost / Units Manufactured
        = $889,700 / 4,100 units
        = $217.00