9-2:2. Four key marketing decision variables are price ( P )advertising ( A ) transportation ( T ) and product quality ( Q ). Consumer demand ( D ) is influenced by thesevariables. The simplest model for describing demandin terms of these variables is:Please be sure your work is organized legible and your responses are substantive. You need to submit all details of your work including excel sheets used to arrive to the solution. It is not enough to attach your excel sheet. You MUST provide interpretation of results and describe conclusions.Due on Day 7 of W5. Late work will receive 10% penalty for every week late!Use APA format.Turn It In (TII): TII is integrated in this course which means you will not need your own account for submitting papers. Your faculty member will decide for each assignment if your paper needs to be submitted to TII. Please submit each assignment only in the Assignments area.