Variable Cost Method of Product Pricing Smart Stream Inc. uses the variable cost method of appling the cost-plus approach to product pricing, The costs of producing and ieling 10,000 cell phones ate as follow: 5imart Stream detires a profic egual to a 30% return on invested assets of $1,200,000. a. Determine the variable costs and the variable cost amourt per unit for the production and sale of 10,000 cel phones. b. Determine the variabite covt markup percentage for cell phones. Mound to two decimal places. c. Determine the selling price of cell phoces. If required, round to the nearest dellar. percell phone