The formula to find the total selling price is
= selling price of one unit × number of units.
Here the selling price of one DVD = $19
There is a total of 85 DVD's sold.
The total selling price of 85 DVD's = 85 ×19 = $1,615
The total amount of money, rounded to the nearest hundred, the store makes by selling 85 DVD's at $19 each is $1,600.