The demand for widgets (QX) is given by the following equation:
QX = 425-PX¡V1.5PW¡V1.25PG+0.8PY+0.1 M
where QX= number of units of widgets sold per week
PX = the price of widgets = 400
PW = the price of woozles = 50
PG = the price of gadgets = 80
PY = the price of whatsits
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