Explanation:
So Plan A starts at $11, while Plan B starts at $29. We can make a chart.
11+2+2+2+2+2+2+2+2+2+2+2+2=35
29+0.5+0.5+0.5+0.5+0.5+0.5+0.5+0.5+0.5+0.5+0.5+0.5+0.5+0.5=35
So A=12, and B=14.
11+2A (since A is the number of movies she'll watch)
29+B/2 (since B is the number of movies she'll watch).
This is all I've got right now since I'm not that smart. Sorry!