For what amount of monthly sales is plan A better than plan B if we assume that Mikes sales are always more than $9,000.00? write your answer in an inequality involving X where x represents the total monthly sales

We will have that the expression A & B are given by the following equations respectively:
[tex]800+0.12x[/tex]&
[tex]950+0.15x[/tex]Now, we solve for "x" the number of sales:
[tex]950+0.15x=800+0.12x\Rightarrow950-800=0.12x-0.15x[/tex][tex]\Rightarrow150=-0.03x\Rightarrow x=-5000[/tex]So, for no amount of months is salary A better than salary B.