Question 252198
There seems to be an error in the question. Based on your profit function, there are no values @ 80,000 between x = 0 and x = 50. If you meant, however, 800,000, we are in business.

Our profit function must = 800,000. So,

{{{-45x^3+2500x^2-275000 = 800000}}}

We set our function = 0 and estimate

{{{-45x^3+2500x^2-1075000 = 0}}}

x = 31.5379 gives us a profit of ~ $800,000.51.

Now if you selling something, we would have to measure in integer units.