Algebra
posted by Debo .
a City's transit authority serves 178500 communters daily when the fare is $1.90. Market research has determined that every penny decrease in the fare will result in 1,050 new riders. what fare will maximize revenue?

Algebra 
Steve
revenue = #riders * fare
= (178500+1050(190x))(.01x) for x<=190
that's just a parabola with vertex at x=180. 
Algebra 
Reiny
number of penny decreases  n
cost of fare = 190n
number of riders = 178500 + 1050n
revenue = R = (190n)(178500+1050n)
P' = (190n)(1050) + (178500 + 1050n)(1)
= 0 for a max of P
178500 + 1050n = 1050(190n)
divide by 1050
170 + n = 190n
2n = 20
n = 10
the fare should be 190+10 = 200
or it should be $ 2.00
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