Mill Street Corporation sells its goods with terms of 5/9 EOM, net 54. What is the implicit cost of the trade credit?

(Round intermediate calculations to 4 decimal places, e.g. 1.2541 and final answer to 2 decimal places, e.g. 12.25%.)

The implicit cost of the trade credit is ____%

Okay so i posted this question twice and its the wrong answer. I also tried doing it with the steps but im not having any luck maybe third times the charm..