8. A particular manufacturing job is subject to an estimated 90% learning curve. The first unit required 40 labor hours to complete. What is the cumulative average time per unit after four units are completed? a. 32.0 hours b. 32.4 hours c. 36.0 hours d. 40.0 hours 9. You purchase baseball tickets last month when the team was doing poorly. You paid $100 a non-refundable ticket. Your best friend offered you $130 for the ticket now that the team is doing well. The opportunity cost of going to the game is a. $30 b. $70 c. $130 d. None of the above_