NEW YORK (Standard&Poor's) Sept. 26, 2007--Standard&Poor's Ratings Services today assigned its ratings to Michigan Higher Education Student Loan Authority's $66.5 million student loan refunding revenue bonds series 20-A and 20-B (see list). The rating on the senior series 20-A bonds reflects the 3.0% subordination of the subordinate series 20-B bonds, the $498,750 reserve account, and excess spread. The rating on the subordinate bonds reflects the $498,750 reserve account and excess spread. Funds from the 20-A and 20-B bonds will be used to finance and refinance the acquisition of eligible loans, make a deposit to the reserve account, and pay the cost of issuance. The bonds are tax-exempt, auction-rate securities. This is the first issuance under the