Based on the information given the publisher’s list price is:$99.99.
Using this formula
List price=Net price/(100%-2=Trade discount)
Where:
Net price=$79.99
Trade discount=20%
Let plug in the formula
List price=$79.99/(100%-20%)
List price =$79.99/80%
List price= $99.99
Inconclusion the publisher’s list price is:$99.99.
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