A game is played with a bag of marbles. The bag contains 3 red, 5 blue, and 10 yellow marbles. A player can reach in the bag and randomly select one marble. If the marble is Red the player gets $12. If the marble is Blue the player receives $4. If the marble is Yellow, the player must pay $6. Find the expected value of a player's winnings. Round your answer to the nearest cent.