QUESTION 2 Grace is an amateur boxer who engages a personal trainer to improve her technique. It costs Grace $40 for each session. Grace gains $200 of total benefit from attending 5 sessions and $250 of total benefit from attending 6 sessions. Which of the following statements are true? The marginal benefit of attending the sixth session is $40. The marginal cost of the sixth session is $50. There is insufficient evidence to determine the marginal benefit from the seventh session of personal training. Grace should attend the sixth session