I would pay $100.00 for the yellow men's bike and $50.00 for the green womans bike.
They both will need a complete tear-down, clean all of the old grease off, clean all of the rust and grime, re-assemble with new grease, cables, brake pads, rim tape, handle-bar tape, new tires and inner-tubes. You're looking at several weekends of work plus about $75 to $100 each for parts.