Eloise pays $40 for a daily pass to the ice skating centre. When inside the cenntre, Eloise considers how many hours of training she should complete. She expects to gain an incremental benefit of $75 from the first hour, then gain subsequent incremental benefits of $50 from the second, $30 from the third, $20 from the fourth and $5 from the fifth. The cost to Eloise, due to the risk of injury and fatigue, is $4 for the first hour, $8 for the second hour, $12 for the third hour, $16 for the fourth hour and $20 for the fifth hour
A. Eloise should train for how many hours
B. The maximum surplus for Eloise, from training the number of hours you found in part b, is $. to the nearest whole number (with no decimal places).