Your brother's start-up firm has been offered credit terms of 4/30, net 90 days. What will be the nominal annual percentage cost of its non-free trade credit if it pays 120 days after the purchase? (Assume a 365-day year.)
a. 16.05%
b. 16.90%
c. 17.74%
d. 18.63%
e. 19.56%