3. 4. The city transit system carries an average of 9450 bus riders a day, for a far of $1.75 each. The city wants to reduce car pollution by increasing ridership and to maximize the transit system's revenue at the same time. A survey indicates that the number of riders will increase by 150 for every $0.05 decrease in fare. a) What fare will result in the greatest revenue? b) What is the expected number of riders and the total daily revenue at this fare