Turn $1 into $100 in about 2 minutes.
So, I can think of a few ways to turn a $1 into a $100 bill in a few minutes.
One would be to back a winning horse that has ridiculous odds. Another is to steal it. You could always ask your kind folks or other relatives for the money. Or perhaps pull a con or scam on some unwitting passers by.
But this way seems the easiest. If only I knew how he did it.