sort table after data update

I have a spreadsheet with 3 tables (all side-by-side). Table one has 8 rows of data; table two has 2 rows of data; table three has 3 rows of data. I am looking for assistance on how to sort each table in desceding order (by sales). Basically I want to do a sort everytime there is a change of values in any of the tables. I have attached a sample spreadsheet to clarify the table layout and the manner in which the values change within each table. Any assistance is greatly appreciated. Thanks.