Question 850688
1200 + 20x is his cost.
You want to find out at what number that will equal 30x.
1200 + 20x = 30x
Subtract 20x from each side
1200 = 10x
Divide each side by 10
120 = x
.
Let's plug it in to be certain.
If the manufacturer makes 120 units, it will cost him:
1200 + (20*120)
1200 + 2400 = 3600
.
He sells them for 30*120, which is 3600
Success!