Ring Company reports the following for 2020. Operating income $ 80,000 Average operating assets $ 300,000 Sales $ 600,000 Operating expenses $ 520,000 Required: a. Calculate the ROI for 2020. (6 marks) b. Ring company plans to invest in a $50,000 equipment that increases sales by $55,000, while increasing operating expenses by $25,000. What is the expected ROI? Should the company go for this plan? Explain. (12 marks)