9. Terms of Sale A firm offers terms of 4/12, net 30. a. What effective annual interest rate does the firm earn when a customer does not take the discount? % Points: 2.5 b. What is the effective annual rate if the discount is changed to 3% ? % Points: 2.5 c. What is the effective annual rate if the credit period is increased to 45 days? % Points: 2.5 d. What is the effective annual rate if the discount period is reduced to 5 days? % Points: 2.5