the 20% was a penalty rate on the auction rate security (ARS, funnily enough). Basically these auctions are held every week. bimonthly or monthly to give the holders the opportunity to sell. If there are no buyers then the generally one of the big banks steps in to provide liquidity. However, the banks are not providing this liquidity backstop anymore as they can't/do not want to expand their balance sheets. As a result the auction "fails" and the issuer has to pay the bag, er bondholder the penalty rate until the next auction/ these penalty rates are normally 10-25% annualised.