I majored in CS and did Business Administration as a minor. I would say all courses were very helpful especially if you consider having your own startup. But if

I majored in CS and did Business Administration as a minor. I would say all courses were very helpful especially if you consider having your own startup. But if that isn't the case then may be applied math or stats would be a better fit. My honest advice is to go with something you like and enjoy other than CS(your major) but you didn't have the time for it.