I think I'm missing a step, not sure where I'm going wrong with this one. Any help is greatly appreciated. Thx so much!

Grant Technologies needs $300,000 to pay its supplier. Grant's bank is offering a 210-day simple interest loan with a quoted interest rate of 11 percent and a 20 percent compensating balance requirement. Assuming there are 360 days in a year and Grant currently holds no funds at the lending bank, what is the annual percentage rate (APR) of the loan?