A bank offers your firm a revolving credit arrangement for up to $90 million at an interest rate of 2.1 percent per quarter. The bank aiso requires you to maintain a compensating balance of 6 percent against the unused portion of the credit line, to be deposited in a non-interest-bearing account. Assume you have a short-term investment
account at the bank that pays 13 percent per quarter, and assume that the bank uses
compound interest on its revolving credit toans a. What is your effective annual interest rate (an opportunity cost) on the revolving credit
arrangement if your firm does not use it during the year?