He would need to at least 44 to sell before breaking even.
Given the function:
f(x) = x³ + 3x² - 4x + 5
The graph of the function is (taken f:
According to the graph above, the maximum and minimum are 18.13 and 3.87, respectively
0.4% = 0.04
0.04 * 1000 = 4
the answer is 4 hope I helped you out!