Answer and Explanation:
As it is given that Ginny takes 3 hours for brewing a root beer gallon and 2 hours to make a pizza
So,
the opportunity cost of brewing a root beer gallon is
= 3 ÷ 2
= 1.5 gallons
And, the ginny opportunity cost for brewing a root beer gallon is
= 7 ÷ 5
= 1.4 gallons
As she takes 5 hours to make a pizza and 7 hours for brewing a root beer gallon