Q1. On March 24, 2014, Brendan and Madison borrow $18,000 each at a simple interest rate r = Brendan's bank calculates interest using exact interest, while Madison's bank uses the Banker's Rule (ordinary interest). Let X= amount Brendan pays back on September 24, 2014, and Y= amount Madison pays back on September 24, 2014. What is the value of X- Y? 12%.