Talk:Worker Cat/@comment-24839283-20190515204657/@comment-24593149-20190603150112

https://www.reddit.com/comments/3mpf2c

According to this post, money production rate is 184.5 (lv1) to 250.5 (lv8) per second with 300% Energy Drink and lv20+10 Worker Cat Efficiency base upgrade

The long and short of it is that it's about 5% increase per worker cat upgrade.