Question 357333
cost per article = 120 / x


revenue = [(120/x) + 1.5] * (x - 1) = 135


120 + 1.5x - (120/x) - 1.5 = 135 ___ 1.5x - (120/x) = 16.5


multiplying by 2x ___ 3x^2 - 240 = 33x ___ x^2 - 11x - 80 = 0


factoring ___ (x + 5)(x - 16) = 0



11 doesn't look so good ...