You are due a tax refund of $690. Your tax preparer offers you a no-interest loan to be paid by your refund check, which will arrive in

four weeks. He charges a fee of $50 for this service. What actual interest rate will you pay for this loan? (Hint: The time period for this loan is not 4/52 because a 365-day year is 52 weeks and 1 day. So use days in your computations.)

The actual interest rate will be.....%?