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They are giving out $6,500 in prize money and $500 worth of tickets are sold??

That's right, but more importantly, we have 500 competitors.

$13

That's right. Now. what was our investment (or cost) to play each time?

so the answer is B.?

Nope, answer my question first.

Each time we play, we win $13 on average. But we have to pay to play. How much do we pay to play?

it cost $1 to play each time

Great. So if we pay $1 to win $13, what is our total profit each time?

$12

Excellent!

Thank you!!!