Answer: Decline in GDP = $1009.3 billion
Step-by-step explanation:
Okun's law shows us the relationship between a nation's unemployment rate and its level of output or real GDP.
According to the Okun's law,

Therefore, a 7% decline in GDP as compared to the level in 2009 means,

= 1009.33 billion or 1009.3 billion
Thus, GDP declined by $1009.3 billion.