Page of 5 - 3. The return on investment for a service is given by ROI 100 - percent, where is the revenue generated by use of the service, and c is the cost to provide the service. A positive ROI indicates a gain, while a negative ROI indicates loss. Sandie provides management consultation, for which she charges $184 per hour and has a fixed cost of $3200 for leasing office space and paying an assistant (b) Write a sentence interpreting the slope of the ROI function in the applied context, including units