Suma AppleScript de una lista

Modificando su intento original:

set myList to {"30.00", "30.00"}
set myFinalTotal to 0

repeat with x in myList
    set myFinalTotal to myFinalTotal + x
end repeat

myFinalTotal

Y por el placer de aprender:

• Recursivo:

  to sumItems from L as list
      if L = {} then return 0
      (L's first item) + (sumItems from the rest of L)
  end sumItems

• Iterativa:

  to sumItems from L as list
      tell (a reference to last item of {0})
          repeat while L ≠ {}
              set the contents to it + (L's first item)
              set L to the rest of L
          end repeat
  
          return the contents
      end tell
   end sumItems

Resuelto : Estoy contando la lista primero y luego hago mi declaración de repetición

set sum to 0
set n to count newTotal

repeat with i from 1 to n
    set sum to sum + (item i of newTotal)
end repeat

return sum