Answer:
$15,000
Explanation:
Gross domestic product is the sum of all final goods and services produced in an economy within a given period which is usually a year.
When calculating GDP, only items produced in the current year are added. The house had been sold in 2007. Adding the sale to the GDP in 2011 would lead to double counting.
It's only the amount paid to the agent that would be added to GDP.
I hope my answer helps you