Hard to say without more specifics. Generic answer would be maybe a quarter of a percent. Ask him to invest now. Even $10. And to help you raise capital (telli

Hard to say without more specifics. Generic answer would be maybe a quarter of a percent. Ask him to invest now. Even $10. And to help you raise capital (telling other people "yes, I put money into them" lends credibility if the guy does in fact have credibility to lend).