Michael I. answered 03/24/19
MA (Economics)/BBA (Finance) (15+ years teaching/tutoring experience)
Hello Brineicia
If you have not yet solved this problem, here is the solution. First of all, you have to find the x-value of the vertex, i.e., -b/2a = -202/-2 = 101 units sold. Then you plug 101 back into the function, i.e.,
-(101)2 + (202)(101) - 5000 = -10,201 + 20,402 - 5000 = $5,201.00 (maximum profit). Therefore, you have to sell 101 units to maximize profit.
Sincerely
Michael I.