Jamal and Keisha each earn money by washing cars and mowing lawns.

Jamal can mow 4 lawns or wash 8 cars in one day.

Keisha can mow 3 lawns or wash 9 cars in one day. They both charge $25 for each lawn and $15 for each car.

The chart shows their production after 3 days.

	Jamal	Keisha
Lawns	12	9
Cars	24	27

Jamal and Keisha are considering entering into an agreement to trade tasks.

How can specialization of labor benefit Jamal and Keisha? Check all that apply.

• Jamal can specialize in washing cars, because he has the comparative advantage.
  
• Keisha can specialize in washing cars, because she has the comparative advantage.
  
• Specialization allows them to collectively mow 3 more lawns and wash 3 more cars every three days.
  
• Specialization allows them to collectively mow 12 more lawns and wash 27 more cars every three days.
  
• Specialization allows them to earn more money.