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 $75,000 and promise to pay back $106,389 at the end of 6 years.
%
You borrow $15,000 and promise to make payments of $4,058.60 at the end of each year for 5 years.
%
