6- Figure 1 shows the change in the price of butter and the quantity of butter bought and sold due to: None of the options O A decrease in average income levels. An increase in the price of milk. An...

Extracted text: 6- Figure 1 shows the change in the price of butter and the quantity of butter bought and sold due to: None of the options O A decrease in average income levels. An increase in the price of milk. An increase in the price of margarine. 7- Kareem can produce either a combination of 40 doors and 60 windows or a combination of 50 doors and 35 windows. If he now produces 40 doors and 60 windows, what is the opportunity cost of producing an additional 10 units of doors? * O 25 windows O 0.4 windows 35 windows O 2.5 windows