Final answer:
The coach violated the NBC-HWC ethics guidelines by not disclosing the commission before the sale of the coaching package.
Step-by-step explanation:
The coach is in violation of the NBC-HWC ethics guidelines because the commission was not disclosed before the sale of the coaching package.
It is important for coaches to provide full transparency to their clients about any potential financial interests or conflicts of interest. By failing to disclose the commission before the sale, the coach breached the ethical guidelines.
In order to maintain client trust and uphold ethical standards, it is necessary for coaches to disclose any potential financial interests upfront, ensuring that clients have all the relevant information before entering into a coaching agreement.