The rate growth G, in thousands of dollars per year, in sales of a certain product is a function of the current sales level s, in thousands of dollars, and the model uses a quadratic function: G=1.2s-0.3s² The model is valid up to a sales level of 4 thousand dollars. A: Express using functional notation the rate of growth in sales at a sales level of 2.260 thousand dollars, and then estimate that value. B: At what sales level is the rate of growth in sales maximized?

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