Part 4: Problems. Answer the following problem. 4-1. Use the following information from the last two years for XYZ Manufacturing Company to find a. and b. below. 2017 6,400,000 2018 Sales Net operating income $1,100,000 $1,350,000 Average operating assets $17,800,000 S16,200,000 $4,900,000 Compute the return on investment for both years. Compute the residual income for both years. Assume a 6% hurdle rate for invested assets. Show your work. a. b