Final answer:
To reduce the trade deficit from -200 to -100 in billions of dollars, savings need to increase by at least 100 billion dollars.
Step-by-step explanation:
The initial question about the percentage decrease does not match the subsequent information. Nevertheless, the given question requires an understanding of how changes in savings affect the trade deficit. To reduce your trade deficit from -200 to -100 in billions of dollars, you need to figure out the necessary increase in savings that equates to this 100 billion dollar improvement.
The trade deficit (X-M) represents the difference between exports (X) and imports (M). A negative number indicates that the country is importing more than it is exporting. To reduce the trade deficit, the savings must increase to offset the needed 100 billion dollars. This could be done by increasing exports, decreasing imports, increasing domestic savings, or a combination of these factors. However, the precise actions needed depend on the broader economic context, which is not specified here. Thus, without more details, the answer would be that savings would have to rise by at least 100 billion dollars to meet the target trade deficit reduction.