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A manufacturer of aluminum doors currently is able to sel 600 doors per week at a price of $75 each. lfthe 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 manufacturers marginalrevenue function. The elasticity of demand for the doors is approximately . {Type an integer or a decimal. Do not round until the nal answer. Then round to the nearest hundredth as needed.)