Answer:
$21.50
Explanation:
The gross domestic product includes the total production of finished and legal goods and services in a country (usually during a one year period).
When the farmer sold the 5 pounds of pecans, he was selling intermediate goods (not included in the GDP). Only Smith's Fresh Pecans are included in the GDP (final goods):
(3 pounds x $4.50) + $8 = $13.50 + $8 = $21.50