How much should I pay for child support in Panama City?

I'm a Brazilian expat living in Panama City with my child. I'm separated from the mother and we're negotiating child support. I earn around $800 a month and my fixed personal expenses are around $250. I also have private health insurance for my child, but I'm not sure if it will increase my costs. The mother earns roughly the same as me and says her fixed expenses (rent and services) take up almost half her paycheck. She's keeping a record of her expenses and says she'll go to court if we can't agree on a payment plan.