Qd=420-30P. From this equation identify the slope of the demand function and calculate the price at 60 units.

In the general demand function Qd=a-bP, b is the slope. Therefore 30 is the slope of this demand function.When Qd=60 price is calculated by:60= 40-30P30P=420-6030P=360P=12

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Answered by Joanna B. Economics tutor

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