Tula lent $15,000 to a business associate on August 12 at 6% simple interest. The loan was to be repaid on November 27; however, the business associate was unable to make the payment. As a consequence, they agreed that the associate could repay the debt on December 29 and that Tula would add $200 to the balance that was due on November 27. What rate of simple interest is Tula charging on the late payment?