Answer:
a. 120, and this indicates that the price level has increased by 20 percent since the base year.
Explanation:
Nominal GDP is the amount of goods and services produced by a country taking inflation and deflation into account. Real GDP is the amount of goods and services produced in a country based on prices of a base year. a base year is a chosen year that is used as a reference.
GDP deflator is calculated as follows:
Nominal GDP ÷ Real GDP × 100
( 12 trillion ÷ 10 trillion ) x 100
= 120
the change ∴ is an increase in 20% from the base year