The researcher studies the relationship between advertising budget and purchases for a product from Household Inc. Variable x is the money spent on advertising, and y is the revenue (both measured in thousands of US dollars). Based on the researcher's dataset, the relationship is linear and can be approximated by the following equation: y=20x+10,000. The manager has decided to increase the advertising spending by $1000 (one unit of measurement) as compared to last year. What is the increase in revenue in the US dollars that she can count on? Group of answer choices $20 $20,000 $30,000 $10,020