某旅店有100间客房,每间客房的定价与每天的住房率的关系如下表:
0 58561 58569 58575 58579 58585 58587 58591 58597 58599 58605 58611 58615 58617 58621 58627 58629 58635 58639 58641 58645 58647 58651 58653 58655 58656 58657 58659 58660 58661 58663 58665 58669 58671 58675 58677 58681 58687 58689 58695 58699 58701 58705 58711 58717 58719 58725 58729 58731 58737 58741 58747 58755 266669
每间住房定价 | 90 | 80 | 70 | 60 | 50 |
每天住房率 | 50% | 60% | 70% | 80% | 90% |
要使此饭店每天收入最高,则每间房价应定为
A.90 B.80 C.70 D.60