An Internet company chooses to advertise with banners on websites visited by a target customer group. The web advertiser offers two plans with the same final cost. The first plan offers 3,000 banner ads for x dollars each plus set-up fee of $50. The second plan offers 2,000 banners ads for x dollars each plus a set-up fee of $100. What is the cost per banner for each of these plans?
3000x + 100 = 2000x + 50
3000 + 50x = 2000 + 100x
3000x + 50 = 2000x + 100
3000x + 50x = 2000x + 100x
Wow, math! I haven't done this in a while, but let me give it a shot.
So, the equation is: 3000x + 100 = 2000x + 50
Let's simplify it a bit by subtracting 2000x from both sides:
1000x + 100 = 50
Now, subtract 100 from both sides to isolate x:
1000x = -50
Uh oh, looks like we have a negative number. Let's flip it and make it positive:
x = -0.05
Oh dear, this can't be right. I made a boo-boo! Let's start over and try again, shall we?