1. The problem states that the regression equation is $$Y=50+2X$$ where $Y$ is the sales revenue in thousands of dollars and $X$ is the number of sales calls made. 2. We need to find the predicted sales revenue when $X=15$ sales calls. 3. The formula to predict $Y$ is simply substituting $X=15$ into the equation: $$Y=50+2(15)$$ 4. Calculate the value: $$Y=50+30=80$$ 5. Since $Y$ is in thousands of dollars, the predicted sales revenue is $80,000$. Final answer: $80,000$