Effective rate of interest

Find the interest rates earned on each of the following. Round each answer to two decimal places.

You borrow $700 and promise to pay back $770 at the end of 1 year.

%

You lend $700 and the borrower promises to pay you $770 at the end of 1 year.

%

You borrow $86,000 and promise to pay back $693,525 at the end of 12 years.

%

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

%