By Mike Moffatt, About.com Guide
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Answer: The slope of a linear demand curve is simply:
Change in Price / Change in Quantity
So when the price changes from $5.00 to $15.00, the quantity changes from 1,000 to 200. This gives us:
15 - 5 / 200 - 1000
10 / -800
-1/80
Thus the slope of the demand curve is given by -1/80.
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