Question 461950
The profit function is P(x) = 8.35x - (7.20x + 2116) = 1.15x - 2116.
Then 4600 = 1.15x - 2116 ==> 1.15x = 6716 ==> x = 5840 units.
-1150 =  1.15x - 2116 ==> 1.15x = 966 ==> x = 840 units.
0 =  1.15x - 2116 ==> 1.15x = 2116 ==> x = 1840 units.