What is the residual income for Rushville Division with investment? () (b) (c) 9. $34,200. $ 6,000 $10,200 S 6,600. What is the return on investment for Rushyille Division with the additional project investment? (a) (b) 10. 34.20% 12.00%. 14.87 % (d) 15.00%. 11. Mattoon Company uses part 65A in the production of color printers. Unit manufacturing costs of part 65A are shown below. MATTOON COMPANY UNIT COSTS INCURRED FOR PRODUCING PART 65A Direct materials 8.00 Direct labor 2.00 Variable manufacturing overhead Fixed manufacturing overhead 1.00 4.00 Mattoon uses 100,000 units of 65A per year. Joliet, Inc. has offered to sell Mattoon 100,000 units of 65A per year for $12 per unit. If the company buys the part from Joliet, fixed manufacturing overhead in total will not change. Should Mattoon make or buy the part? (a) Make the part because it will save $100,000. (b) Buy the part because it will save $100,000. (c) Make the part because it will save $300,000. (d) Buy the part because it will save $300,000