Can someone explain the example to me?

I don't understand how the answer can be 15.

Since the first 2 people got 0 correct predictions and the last person got 1 correct prediction, shouldn't the amount paid only be 5?

Re: Can someone explain the example to me?

First two people got more then 0 correct predictions because: "four sets of gold medals, four sets of silver medals, and four sets of bronze medals are awarded"