You are the proud owner of a baseball card store. Suppose you sell $100.00 worth the baseball cards each day, with one employee operating the store for you. You decide to hire a second worker, and the two workers together sell $150.00 worth of baseball cards. What is your second worker's marginal revenue product (MRP)? If the price per card sold is $5.00, what is the second worker's marginal product (MP)?