I need help with how to solve this problem.

1 In another game at Bonehead Casino in Reno, the player draws one card from a standard deck. If it is an A, then the player wins $40; a K, Q, then the player wins $30; an 8, 7, then the player wins $10; anything else, then the player loses. It costs $9 to play (for each play). Now, Melvin plays the game 8000 times, Rufus plays the game 150,000 times. Find the probability that (a) Melvin makes $3120 or more. (b) Rufus makes $22,500 or more