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 answer as a percentage rounded to 1 decimal place (i.e., 32.1).)

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

2/10, net 90