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lachisa
Answers (1)
the short-run average cost is TAC=y^2/y-20y/y+400/y =y-20+400/y The marginal cost curve is the first derivative of the cost curve. so,mc=2y-20 short run average cost reaches it's minimum when smc=sAc or the derivative of SAC=0 SO,2y-20=y-20+400/y
