A new shoe company is trying to compete with Nike. They are measuring their profit over the course of 6 months to see if their profit model is allowing them to earn maximum profit. After month 3 they have made a profit of $15,500. After month 6, they made a profit of $22,000. Assuming that their profit can be modeled by a linear function, the average rate that the company earns profit is approximately _____with a unit of _____
