How to create a simple sum of the values in a column

[jason_poquette-]

I apologize this question is so basic...but I am brand new to Looker and cant figure it out.

I have created a Look that provides a snapshot of my inventory, with dollar amounts for each item. There are about 1200 rows of inventory items with costs. All I want to do is for the column with the dollar amounts to provide a sum at the bottom. A simple sum is all I’m looking for.