Properly Calculating a Profit Split based on Expense Recovery (attachment)

This is probably less complicated than it feels. My brain is jello from overthinking this... so I'm asking for help.

The idea here is that we want to get 60% of revenues until we recover 150% of expenses, and 50% of revenues thereafter.

Any insight or help would be sincerely and humbly appreciated.

Thank you!

OK- closing this thread.