Creating a % of Sales Column

Version 1

    I have created a summary version of my company income statement and I am trying to create a column that calculates a Percentage of sales.  As you can see in the picture below, I have created a measure of each year of the Income Statement.  In addition, I have started to write the denominator to the sales equation but I am not sure how to calculate the numerator of this equation.  I believe this would just be a calculation of dollars based on the Summary income statement categories in my table below. 

    Any help would be greatly appreciated.