First, you need to talk to an accountant to work out those details so everything is handled legally and correctly. The answer depends a great deal on what kind of company you have set up.

If you're an LLC then the profits get distributed to the owners based upon the percentage they own. The revenue first goes to the business to pay bills. Whatever is left over is considered profit. 15% of that profit would go to the investor and the rest would go to whoever owns the other 85%.

Of course you can both choose to reinvest the money back into the business. For tax purposes that money would be considered profit to you personally, but the money stays in the business to help fuel growth.