The demand function for electric fans is as follows: • Qx = 100 – 0.5Px + 0.03I + 3Py where: • Qx = quantity demanded of electric fans • Px = average price of an electric fan • I = average income • Py = average price of an air conditioner Assume that the average price of an electric fan is $50, an air conditioner costs $400 and average income is $4,000. Determine or calculate the following: 1. The slope of the demand curve, 2. If air-conditioners are complimentary or substitutionary to electric fans with respect to the coefficient and, 3. If electric fans are a normal or inferior good with respect to the income coefficient.

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