$174 billion is the answer.
Step-by-step explanation:
Given data: Current GDP = $13.6 trillion, potential GDP = $14.0 trillion, Loader = 5.0, Tax multiplier = 4.0.
It has been assumed in the question that the other factors are constant
Change in the GDP = government multiplier (Change in G)


(increase in Government spending)
Now,


=174 $ billion (fall in taxes) (rounded off to the nearest integer figure).