The jeans store sells 7 pairs of jeans per day when it charges $100 per pair. it sells 8 pairs of jeans per day at a price of $90 per pair. the marginal revenue of the eighth pair of jeans is $10. $20. $90. $100.

Southeastern oklahoma state university's business program has the facilities and faculty to handle an enrollment of 2,000 new students per semester. however, in an effort to limit class sizes to a "reasonable" level (under 200 generally), southeastern's dean, holly lutze, placed a ceiling on enrollment of 1,600 new students. although there was ample demand for business courses last semester, conflicting schedules allowed only 1,440 new students to take business courses.the utilization rate for southeastern=%the efficiency rate for southeastern=%