Answer:
$200 billion
Explanation:
Okun's law (or rule of thumb) states that for every 1% point drop in unemployment, the total output of the economy will increase by two percent.
In this case, since unemployment varies by 1% (= 5.5% - 4.5%), that would mean that the potential GDP differs in $200 billion (= $10 trillion x 2%) depending on which economist's unemployment estimation we use.