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

1. You borrow $750 and promise to pay back $780 at the end of 1 year.

   =%?

2. You lend $750 and the borrower promises to pay you $780 at the end of 1 year.

   =%?

3. You borrow $86,000 and promise to pay back $329,885 at the end of 11 years.

   =%?

4. You borrow $9,000 and promise to make payments of $2,684.80 at the end of each year for 5 years.

   = %?