Find the interest rates earned on each of the following. Round your answers to the nearest whole number.

1. You borrow $720 and promise to pay back $792 at the end of 1 year.

   _______ %

2. You lend $720 and the borrower promises to pay you $792 at the end of 1 year.

   _______ %

3. You borrow $89,000 and promise to pay back $126,249 at the end of 6 years.

   _______%

4. You borrow $15,000 and promise to make payments of $4,058.60 at the end of each year for 5 years.