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Michle obtient une promotion et son revenu annuel passe de 30000$ 30500$. Ses achats annuels de pommes de terre passent de six huit sacs. D'aprs

Michle obtient une promotion et son revenu annuel passe de 30000$ 30500$. Ses achats annuels de pommes de terre passent de six huit sacs. D'aprs ces informations, les pommes de terre sont-elles un bien infrieur ou un bien normal pour Michle? Expliquez.

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