You purchase 4 videos
The original price of each video is x dollars
You decide to purchase the limited edition versions of the videos for an additional cost
Your total cost is (4x + 20) dollars
So, total additional cost is $20
since, we are purchasing 4 videos
so, additional cost in each videos is
[tex]=\frac{20}{4}[/tex]
[tex]=5[/tex]
So, limited edition cost additional $5 per videos.........Answer