Find the interest rates earned on each of the following. Round your answers to the nearest whole number. a. You borrow $750 and promise to pay back $780 at the end of 1 year. % b. You lend $750 and the borrower promises to pay you $780 at the end of 1 year, % c. You borrow $50,000 and promise to pay back $239,273 at the end of 9 years. % d. You borrow $11,000 and promise to make payments of $3,359.50 at the end of each year for 5 years. %