Hi Mario,
Yes there is a way to put the last column in as you require.
The table creates a variable called "lay".
What is done here is create a new variable called "output".
You first extract the columns you need.
Do the arithmatic on the extracted columns in an element by element fashion (With one vectorised expression)
Then reassemble the required individual columns with the "augment" function.
Have enclosed a file that does this as an extension of the one provided.
If required you can set the assign the original "lay" to the new values "output"
Hope it helps.