A firm offers terms of 1.8/10, net 60.

a. What effective annual interest rate does the firm earn when a customer does not take the discount? (Use 365 days a year.Do not round intermediate calculations and round your final answer to 2 decimal places. (e.g., 32.16)) Effective annual interest rate %

b. What effective annual interest rate does the firm earn if the terms are changed to 2.8/10, net 60, and the customer does not take the discount? (Use 365 days a year. Do not round intermediate calculations and round your final answer to 2 decimal places. (e.g., 32.16)) Effective annual interest rate %

c. What effective annual interest rate does the firm earn if the terms are changed to 1.8/10, net 75, and the customer does not take the discount? (Use 365 days a year. Do not round intermediate calculations and round your final answer to 2 decimal places. (e.g., 32.16)) Effective annual interest rate %

d. What effective annual interest rate does the firm earn if the terms are changed to 1.8/15, net 60, and the customer does not take the discount? (Use 365 days a year. Do not round intermediate calculations and round your final answer to 2 decimal places. (e.g., 32.16)) Effective annual interest rate