Year Guns Produced Price of Guns Butter Produced Price of Butter
2009 80 $4 40 $3
2018 90 5 60 10
Consider the following data for Tyrovia, a country that produces only two products: guns and butter.
Real GDP for Tyrovia for 2018 using 2009 as the base year equals:________.
A) $1,140.
B) $880.
C) $690.
D) $540.