"This will reduce your profit by nearly 30%" is accurate, and real profit is about all anyone cares about (or should care about). Many people would not choose that, if they could choose, but it's effectively required at the moment.
You are still assuming that the company will do the exact same amount of business, with or without credit cards. That's after I went to considerable effort to explain your error. You're just repeating it.
You are still assuming that the company will do the exact same amount of business, with or without credit cards. That's after I went to considerable effort to explain your error. You're just repeating it.
Good luck.