Consider three different closed economies with the following national income statistics. Country A has taxes of $40 billion, transfers of $20 billion, and government expenditures on goods and services of $30 billion. County B has private savings of $60 billion, and investment expenditures of $50 billion. Country C has GDP of $300 billion, investment of $70, consumption of $180 billion, taxes of $60 billion and transfers of $20 billion. From this information we know that there is a $10 billion government budget deficit for

a.only country A.

b.only country B.

c.only country C.

d.all three countries.

Can someone explain how you get this answer? Like the formulas you use and what numbers go with those formulas?