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A manufacturer of aluminum doors currently is able to sell 600 doors per week at a price of $75 each. If the price were lowered to $70 each, an additional 60 doors per week could be sold. Estimate the current elasticity of demand for the doors, and also estimate the current value of the manufacturer's marginal-revenue function. The elasticity of demand for the doors is approximately]. (Type an integer or a decimal. Do not round until the final answer. Then round to the nearest hundredth as needed.)