Answer and Explanation:
The opportunity cost for pizza making of Megan is 2 ÷ 3 root beer gallon
And, the opportunity cost for pizza making of Susan is 5 ÷ 7 root beer gallon
Also Megan earned an advantage for pizza making as she takes only two hours while on the other hand Susan takes hours
And, the opportunity cost of Megan is lower than the Susan that results that Megan has the comparative advantage this determines that there is a exchange for a root beer what Susan made
It could be better off by 5 ÷ 7 root beer gallon
And, the lesser price could be better of 2 ÷ 3 root beer gallon