Howes Inc. purchases $4,562,500 in goods per year from its sole supplier on terms of 2/15, net 50. If the firm chooses to pay on time but does not take the discount, what is the effective annual percentage cost of its non-free trade credit? (Assume a 365-day year.) a. 22.28% b. 23.45% c. 21.17% d. 24.63% e. 20.11%