
Kenneth S. answered 10/19/17
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Let new price be p. Attendance A(p) will be 400 - 20(p-11) = 620 - 20p. p>11
Then revenue R(p) will be = pA(p) = 620p - 20p2.
Study this; do you agree?
Then the revenue function is a parabola and at its vertex the maximum occurs.
vertex occurs when p = -b/(2a) = -620 /(-40) = $15.50