Product Cost Method of Product Costing Voice Com, Inc. uses the product cost method of applying the cost-plus approach to product pricing. The costs of producing and selling 5,080 cell phones are as follows: Variable costs per unit: Voice Com desires a profit equal to a 16% return on invested assets of $600,900. a. Determine the amount of desired profit from the production and sale of 5,080 cell phones. $ b. Determine the product cost per unit for the production of 5,080 cell phones. Round your answer to the nearest whole dollar. $ per unit c. Determine the product cost markup percentage for cell phones. Round your answer to two decimal places. %