Saul Company makes complex portable four-stage radar systems for the defense industry and makes three types of systems from a joint process. Total joint costs are $224,000 each month. All radar system types types, A, B & C, can be sold at the split-off point. All of the radar system types can also be processing further and sold as a different model with enhanced features. The following applies: Later Unit Cost Immediate Sales of Further Units Sales Price Price Processing A 20,000 $ 6 $10 $8 B 40,000 $ 5 C 60,000 $ 9 $16 $11 $4 $6 Which radar systems type would result in additional income if it was processed further