Final answer:
The real GDP in 2015 was $250 billion, calculated using the formula Real GDP = Nominal GDP ÷ (GDP Deflator ÷ 100) with a nominal GDP of $250 billion and a GDP deflator of 100.
Step-by-step explanation:
The student's question is about calculating the real GDP for the year 2015 using the provided nominal GDP and the GDP deflator. To calculate real GDP, we use the formula:
Real GDP = (Nominal GDP) ÷ (GDP Deflator ÷ 100)
Given that the nominal GDP in 2015 was $250 billion and the GDP deflator was 100, we can plug these values into the formula:
Real GDP = $250 billion ÷ (100 ÷ 100) = $250 billion
Therefore, the real GDP in 2015 was $250 billion, which matches option b. The GDP deflator serves as a way to account for inflation by converting the nominal GDP into real GDP. This allows us to measure the true growth of the economy by removing the effects of changing price levels.