A certain stock started at a high value of $9 per share and has been oscillating above and below the average value, decreasing by 3% per year. However, the average value started at $6 per share and has grown linearly by 60 cents per year. Which of the following represents the equation for the midline and amplitude of this stock?

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A certain stock started at a high value of $9 per share and has been oscillating above and below the average value, decreasing by 3% per year. However, the average value started at $6 per share and has grown linearly by 60 cents per year. Which of the following represents the equation for the midline and amplitude of this stock?