As product$-$marketing manager of Ananta LLC$,$ one of your jobs is to prepare recommendations to the Executive Committee as to how much budget should be allocated to advertising $($referred to as AdBudget$).$ Your product sells for $$40$ and costs you $$25$ to produce.

In addition to production costs, Ananta's product$-$marketing managers must take into account the cost of the sales force $($projected to be a fixed amount of $$34,000$ over the year$),$ the amount spent on advertising itself $($referred to as AdBudget$),$ and overhead costs $($typically around $\%15$ of total revenues$).$

Clearly, advertising will increase sales, but there are limits to its impact. Ananta's consultants several years ago estimated the relationship between advertising and sales. Converting that relationship to current conditions gives the following formula:

Units Sold $=35\sqrt[\phantom{2}]{3000+\text{A}\text{d}\text{B}\text{u}\text{d}\text{g}\text{e}\text{t}}$

Which of the followings is the dectsion variable in this problem?

AdBudget

Selling Price

Units Sold

Salesforce Cost