8. In roulette, a ball is dropped onto a spinning wheel. The ball is equally likely to land on any of the wheel's 38 spaces. 18 spaces are red, 18 are black, and 2 are green. You place a $10 bet on red. If the ball lands on a black or green space, you lose your bet. If it lands on a red space, you keep your $10 bet and win another $10. What is the expected value of your bet? Explain.