Effective rate of interest

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

You borrow $650 and promise to pay back $780 at the end of 1 year.

%

You lend $650 and the borrower promises to pay you $780 at the end of 1 year.

%

You borrow $91,000 and promise to pay back $163,886 at the end of 15 years.

%

You borrow $18,000 and promise to make payments of $4,390.00 at the end of each year for 5 years.

%