A firm buys on terms of 2/8, net 45 days, it does not take discounts, and it actually pays after 58 days. What is the effective annual percentage cost of its nonfree trade credit? (Use a 365-day year.)
a. 14.34%
b. 15.10%
c. 15.89%
d. 16.69%
e. 17.52%