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12. The table below shows the retail price and sales for instant coffee and roasted coffee for two years. Retail Price of Instant Coffee ($/Lb) 10.35 10.48 Sales of Instant Coffee (Million Lbs) Year Retail Price of Roasted Coffee ($/Lb) 4.11 3.76 Sales of Roasted Coffee (Million Lbs) Year 1 75 820 Year 2 70 850 a. Using these data alone, estimate the short-run price elasticity of demand for roasted coffee. Derive a linear demand curve for roasted coffee