Well, it depends on what you want to do and what you mainly want to study.
Do you want to be a software developer for a biotech firm with an eye towards management?
Do you want to be a manager or marketing specialist at a pharmaceutical company?
Do you want to be a bioinformaticist with an academic medical center?
I mean, I’m just throwing out careers there, but what you want to do and which skills are necessary for that really will determine what you major and minor in. If you want to do things that are more computer scienc-y (software developing, informatics, so writing code, talking tech, etc.) then you’ll need a computer science major moreso. If you want to emphasize the biology side while using tools from CS to get done what you want to get done, then major in biology. I’m not a huge fan of business majors in general so I think you should pick one or both of the other two and maybe just take some business classes - but if you’re more interested in the management or business side of a biological/biomedical or biotech/technology company, then business with a side of CS and bio might be your best bet.
OR OR OR. If you are at a college that allows you to design your own major (which is most of them!!) you could design a major that blends together the best elements of CS and biology - call it computational biology or bioinformatics - and then minor in or take classes in business.
Incidentally, there are a few colleges with a major in computational biology or bioinformatics. Harvey Mudd, Wash U, Cornell, Carnegie Mellon, Boston College, WPI, and USC all offer computational biology majors or tracks within their biology majors. Brigham Young, Loyola Chicago, University of Pittsburgh, Davidson College, Hunter College, and several other public universities offer a major in bioinformatics.
Also, there is a difference between computational biology and bioinformatics. Bioinformatics is more about the engineering side, about creating tools to work on biological data. Computational biology is about using computational techniques to study biology, and it’s more on the science side.