Sum the numbers of an array (Shopping Bill)

Good Morning !

In the billow link, you can find the code to make a shopping bill.

Meaning :

Array Cost Item : Price of an article, for example, a electric rasor costs 6,44 , the hair cutter costs15,52 and a set of scissor costs 7,08.
Price : value of the selected item
Total : adding all the item; 6,44 + 15,52 + 7,08 =
29,04 $
Index Cost Item : select an item in the array. full:true"]

Shopping Bill|308x500