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

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

%

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

%

You borrow $78,000 and promise to pay back $162,157 at the end of 15 years.

%

You borrow $20,000 and promise to make payments of $6,687.60 at the end of each year for 5 years.

%