The country of bienmundo does not trade with any other country. its gdp is $30 billion. its government purchases $5 billion worth of goods and services each year, collects $7 billion in taxes, and provides $3 billion in transfer payments to households. private saving in bienmundo amounts to $5 billion. what are consumption and investment in bienmundo?
a. $18 billion and $5 billion, respectively
b. $21 billion and $4 billion, respectively
c. $13 billion and $7 billion, respectively
d. there is not enough information to answer the question.