Find Units

Please excuse my ignorance, but I am really in a bind. I am not a Mathcad wiz, but I need to use it for a graduate class. I have a Mathcad sheet I have started, but I cannot figure out for the life of me how to get the final units in the proper format (ft).

I am using the given/find solve block. I have defined all variables prior to the solve block. Spreadsheet is attached.