A retail chain predicts quarterly profit (in millions) using $y=12,300+4.50x_1-3.75x_2$, where $x_1$ is the number of new products launched and $x_2$ is the average marketing spend per product (in thousands). What is the predicted profit if $x_1=300$ and $x_2=800$?

• A. $11,700$
• B. $9,900$
• C. $12,900$
• D. $10,650$