Question 50584
Let x be the fare in dollars, e.g. 2.00, 2.25, 2.50 etc
For each increase of 0.25 over 2.00 we lose 50 customers.

Number of customers = 1000 - [(x-2)/(0.25)]*50

This can be simplified as follows:
# = 1000 -(x-2)*200
#=  1000 -[200x-400]
#=  1000 -200x+400
# = 1400-200x

Since x is the fare the domain is x= 2, 2.25, 2.50,...up to 2+(20)0.25=7.00
And the range is 1000, 950,900,... down to 0  

Cheers,
Stan H.