Dave has 5 hours to divide between designing a test for his ECON102 module, and watching

sports. He cannot simultaneously work on his test and watch sports. In order to have a

"good" test, he must devote the full 5 hours to designing the test, while a "bad" test takes

only 30 minutes to prepare. Dave gets 100 worth of satisfaction out of designing a good

test, and 5 worth of satisfaction from a bad test. He values each hour of watching sports at

12. Dave's opportunity cost of designing a good test is .

(a) Less than 40

(b) Between 40 and 50

(c) Between 50 and 60

(d) Greater than 60