Rust Bucket Motor Credit Corporation (RBMCC), a subsidiary of Rust Bucket Motor, offered some securities for sale to the public on March 28, 2007. Under the terms of the deal, RBMCC promised to repay the owner of one of these securities $99405 on March 28, 2033, but investors would receive nothing until then. Investors paid RBMCC $25378 for each of these securities; so they gave up $25378 on March 28, 2007, for the promise of a $99405 payment in 2033. Based on the $25378 price, what rate was RBMCC paying to borrow money? (answer in percent) (round 2 decimal places)