An auto company’s sales volume can be modeled by ${6.7x^{2}+6.6x+4.9}$, and its cost can be modeled by ${2.6x^{2}-3.2x+4.9}$, where $x$ represents the number of cars produced, and $y$ stands for money in thousand dollars. We can calculate the company’s net profit by subtracting cost from sales. Find the polynomial which models the company’s sales in thousands of dollars. The company’s profit can be modeled by dollars.