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    Derivatives help for economics (PED using calculus = dQ/dP x P/Q)

    Hi guys, I know this will be a really silly Q but I just cannot understand it. For any of you that know some economics, I understand that PED using calculus = dQ/dP x P/Q Q = 60 - 3P and so am I right in thinking that the derivative of Q (dQ) is equal to -3? We are asked to find the PED when...
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