On the image below you can see a standard webshop shopping-cart with some items in it. Your task is to 
-  pinpoint/mark at least 3 elements of a library (functions/methods) 
-  give the function concerned a name 
-  describe which library element might have been used to program it (e.g. date-function, tax-function, etc.) 
The first example shows what the result is expected to be look like:
