ABBV at the current time is selling for $34.51 and ABTWI is selling for $30.20, which added together equals $64,71. ABT at the current time is selling for $64.71. Just as if you took $20 to the bank and got change, say two $10, they are the same. And, no when one changes a $20 bill at the bank for 2 $10 dollar bills, one doesn't pay a tax.