A hospital combines surgeons and operating rooms to treat patients. The isoduant displays the combinations of hospital rooms and surgeons required to treat 400 patients. If the daily cost of hiring a surgeon is $300 a day and operating rooms cost $120 per day, what is the marginal productivity of surgeons relative to operating rooms at the cost-minimizing output quantity? To review this concept. see the section Cost Minimization in the Short-run. 100 quantity of operating rooms 90 30- 70 50 so 40 - 30- 20 10 - T o=4uo 10 20 30 91-0 50 60 quantity of surgeons