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3. Massey Mining Company's ore reserves are being depleted, so the firm's sales are falling. In addition, its pit is getting deeper each year, so its costs are rising. As a result, the company's earnings and dividends are declining at a constant rate of 3 percent per year. If Do = $2 and rs = 5%, what is the value of Massey Mining Company's stock? 4. Gardening & More is becoming more popular, so the firm's sales are soaring. In addition, due to economies of scale, its costs are declining. As a result, the company's earnings and dividends are growing at a constant rate of 4 percent per year. If D. = $8 and r. = 10%, what is the value of Gardening & More's stock