I'm a wager for more than 15 years. In the past, I make few gadgets(using uC) for myself, my friends or my employer(free, never commercialised, using my free time :)) for fun.
Recently, I was asked to do some moonlighting job and I think I can deliver it. The problem is he want me to quote him the charge, which I never done before.
How normally you charge your customer?
1) By hours?
2) Percentage?
3) Line of code?
4) NRE, one-time?
5) Magic number?
6) Ask spouse?
7) ?????

Thanks