Answer:
a. 72 billion
b. 69.2%
Explanation:
a. The absolute size of its public debt in year 4 would be the total value of the deficit from year 1 till 4.
= 0 + 50 + 30 - 10 (budget surplus so it reduces deficit) - 2
= 72 billion
b. Percentage of real GDP in year 4;
= (72/104) * 100%
= 69.2%