1. A commuter train carries 2000 passengers daily from a suburb into a large city. The cost to ride the train is $7.00 per person. Market research shows that 40 fewer people would ride the train for each $0.10 increase in the fare, and 40 more people would ride the train for each $0.10 decrease. If the capacity of the train is 2600 passengers, and carrying fewer than 1600 passengers means costs exceed revenue, what fare should the railway charge to ge the largest possible revenue