Because most of accounting is stupid shit and the math isn't difficult at all.
< Accounting major.
I'm only in my second year of accounting, but honestly, I don't think the math part of it is very advanced. It's more just following rules and learning a whole system of lingo that you need to apply to a bunch of shit. In fact, for my accounting degree I think I need to take like 3 math classes, and they are easy things like statistics, pre-calc, etc.
EDIT - Speaking of which, are there any accountants here? I got a couple questions about the career.