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Remember demand function was expressed as: qD q = quantity. And the formula is qDp (how many units will be sold at what price).
Quick Review before the example:
pD = inverse demand function
qD = deman function
qDp = how many consumers are willing to buy (demand) if price is p
pDq = how much suppliers are willing to produce/supply if price is p
Remember the last example:
6q+8p=125
In this case we want "p" (or express in p) on the left as opposed to "q"
6q+8p=125
-6q -6q
8p = 125-6q
pDq = 125-6q/8
Then let's substitute w/ 4 as in the last example
p = (125-6x4)/8
p = 125 - 24/8
p = 101/8
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