The company's sales increase at a rate of $940 per month
Here, given the equation of the line of best fit, we want to get the amount by which the company sales increase per month
From the description of the question, we are being asked about the rate of change
The rate of change in a linear model talks about the slope
From the equation of the linear model, the slope is 0.94
The question states that the sales are in multiples of $1000
Hence, what we do in this case is to multiply the slope by this
Multiplying the slope by $1,000, we get $940