In a large enterprise network, a configuration management system is implemented to ensure that all devices maintain compliance with security policies. The network administrator needs to assess the compliance of the devices against a baseline configuration that includes specific settings for firewalls, routers, and switches. If the baseline configuration specifies that all firewalls must have a specific rule set enabled, and the compliance check reveals that 80% of the firewalls are compliant, while 20% are not, what is the percentage of devices that are non-compliant if there are a total of 50 firewalls in the network?