Answer the following questions assuming a 360-day year. Required: a. Calculate the approximate annual rate of return on investment of the following cash discount terms: (Do not round intermediate calculations. Enter your answers as a percentage rounded to 1 decimal place (i.e., 32.1).) ROI 1. 3/15 net 30 2. 4/10 net 60 3. 1/10 net 90 b. Which of these terms, if any, is not likely to be a significant incentive to the customer to pay promptly? 3/15, net 30 4/10, net 60 1/10, net 90