Question 718055
Manufacturer spends 550000+n*120 dollars.  Manufacturer receives n*140 and THIS is the quantity which you want being greater than the spending.


{{{550000+120n<=140n}}}, and you want that whole number value of n.  Do you get the same or equivalent inequality?


{{{27500+6n<=7n}}}.  Subtract 6n from both sides.  You are NOT wrong.