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The demand curve for a product is given Qd = 1500 − 5Px − 0.2Pz
by where Pz = $300.

What is the cross-price elasticity of demand between good X and
good Z when Px = $125?

What about when Px = $200?

Are goods X and Z substitutes or complements?

Please typewrite your answers, no handwritten answers
please.