Question 1002286
Let the ticket price be given by the formula (170-x)  where x is the number of pennies in price reduction
You are told the ridership formula is (192,000 + 1200x)  (for each reduction of a penny you get 1200 more riders)

Total revenue is the product of those two formulas
{{{revenue = (192000+1200x)(170-x)}}}
{{{revenue = 32640000+12000x-1200x^2}}}
*[invoke quadratic "x", -1200,12000,32640000 ]

The maximum revenue will be found at the midpoint of the two zeros. (170-(-160))/2 = 115

Does that match what you would get?