The equation set up is:
0.5x² - 40x + 15300 = 0
Cost, C(x) = 35x + 300
Revenue, R(x) = 75x - 0.5x²
Profit, P(x) = 15000
Profit = Revenue - Cost
P(x) = R(x) - C(x)
15000 = 75x - 0.5x² - (35x + 300)
15000 = -0.5x² + 40x - 300
0.5x² - 40x + 15000 + 300 = 0
The quadratic equation to get the number of items sold is shown below:
0.5x² - 40x + 15300 = 0
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