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