A group can charter a particular aircraft at a fixed total cost. If 36 people charter the aircraft rather than 40 people, then the cost per person is greater by 12$.
(a)what is the fixed total cost to charter the aircraft?
(b)what is the cost per person if 40 people charter the aircraft?
这道题是什么意思啊?is greater by 12$是说比12 更大么?还是12的倍数?读不懂。。。T_T求解救!!!!