you can do anything business/finance related.

most of the acc/bus(b&f) students end up in big 4 acct firms, or banks in various roles. some also go into MNC finance / corp strategy roles. a handful of grads go into consulting firms, both large and boutique.

all else equal, the double degree provides you with an edge over your single degree peers when it comes to jobs, but you spend an extra year studying.