A three-class sequential pay CMO has an initial principal balance of $30 million per class. In the first month, interest payments of $5 million and principal payments of $2 million are received. In the second month, Class A holders receive interest on principal and Class B holders receive interest on ___ principal. $28 million; $30 million $30 million; $30 million $27 million; $27 million $28 million; $28 million