Okay, here we have this:
Considering the provided information we obtain the following:
4 singles P(1)=4/17
8 fives P(5)=8/17
3 twenties P(20)=3/17
2 hundreds P(100)=2/17
E(X)=1*4/17+5*8/17+20*3/17+100*2/17
E(X)≈17.882
Finally we obtain that the fair price to play this game is approximately $17.882.