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1212Monthly demand for gasoline at a particular location, as a function of the price of gasoline and the price of bus travel, is given (in hundreds of gallons) as . The slope of the demand curve for gasoline is closest to:

A -0.07.

1212The demand curve (price as a function of {Q_D}) is found by inverting the demand function:

The slope of this function (for any positive value of {P_{bus}}) s -1/15, or -0.0667.


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