A photo booth charges a $500 fee for 2 hours at a party plus $50 per additional hour Cindy doesn't want to spend more than $700 on photo booth rental what is the maximum number of additional hours beyond the first two that Cindy can rent the photo booth for her party

The fee for the first 2 hours is $500.

Cindy wants to spend a maximum of $700, so she has $700 - $500 = $200 left to spend on additional hours.
Since each additional hour costs $50, Cindy can rent the photo booth for a maximum of $200 / $50 = <<200/50=4>>4 additional hours. Answer: \boxed{4}.