I guess what you mean is how much you will get if you invest in bitcoin so it all depend on you how you gonna invest your one bitcoin here so there are many sites where you can invest your bitcoin like trading,gambling or hyip.
Don't suggest anybody investing into gambling, hyip etc because all of them are very risky, better let him learn some basic things about bitcoin.
Bitcoin is future currency but you have to learn many things about bitcoin, how you can make money through by investing into bitcoin, bitcoin itself is an investment.