Use checkbox widget to create a total

Question

I woud like to be able to use the checkbox widget with variables & advanced actions to create a calculated total. 
I have preassigned dollar amounts for each item I've added to the checkbox widget.  I created a variable for each item (tied it in on the checkbox widget) and in the variable "Value" field I assigned the dollar amount I need each one to be.
Based on which items the user checks in the checkbox widget, I want the items checked to equal 1 total at the end.  Where I am caught, is how do I write the advanced action to add up all the assigned totals for each item checked off and then total those to one field?  I did assign a variable to the box where the total should be.
I think I'm definitely stuck in the "advanced actions" step.  I've attempted several advanced actions and they are not pulling a total in the box. 
Below are screen shots of what I've done...I'm a novice variable / advanced actions user so I need detailed assistance please

Answer 1

Did you read my blog post about using checkboxes? http://blog.lilybiri.com/widgets-and-custom-questions-part-1   and   http://blog.lilybiri.com/extended-widgets-for-custom-mcq-and-tf-questi ?
Those variables associated with the checkboxes will store the chosen answer. It has no sense to assign a value to them, you misunderstand what they are meant to store.