Let’s Play a Game! You select 5 cards from a deck of 52 cards without replacement. If ALL FIVE CARDS ARE SPAD?

Probability: Please explain, I keep getting the wrong answer :( Let’s Play a Game! You select 5 cards from a deck of 52 cards without replacement. If ALL FIVE CARDS ARE SPADES, you get $100. Otherwise, you pay $50. It costs $8.50 to play this game. What is the expected value of the gain?