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Lorsque le prix d'un roman est de 20 $, la quantit demande est de 200 units. En revanche, lorsque le prix est de 22 $,

Lorsque le prix d'un roman est de 20 $, la quantit demande est de 200 units. En revanche, lorsque le prix est de 22 $, la quantit demande diminue 180 units. En utilisant la mthode du point milieu, quelle est la valeur de l'lasticit-prix de la demande(en valeur absolue) qui correspond ce changement de prix ? (Note: Pour le rsultat gardez deux chiffres aprs la virgule)

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