What price will the price elasticity of market demand be

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Jen, Eric, and Kurt are all buyers of chain saws. Jen’s demand function is DJ (p) = 520 − 13p, Eric’s demand function is DE(p) = 40 − p, and Kurt’s demand function is DK(p) = 200 − 5p. Together, these three constitute the entire demand for chain saws. At what price will the price elasticity of market demand be −1?

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