Please help with appendix ex 9-23 questions a, b and c. Thank you

Chapter 9 Differential Analysis and Product Pricing 399 EX 9-18 Product cost concept of product costing Smart Stream Inc. uses the product cost concept of applying the cost-plus approach to product pricing. The costs of producing and selling 10,000 cellular phones are as follows: OBJ. 2 Variable costs per unit: Fixed costs: Direct materials Direct labor Factory overhead Selling and administrative expenses $150 25 40 Factory overhead Selling and admin. exp. 140,000 $350,000 25 $240 Total Smart Stream desires a profit equal to a 30% rate of return on invested assets of $1,200,000. a. Determine the amount of desired profit from the production and sale of 10,000 cellular