5-4: Finding the Interest Rate, I 5-16: Comparing Interest Rates Effective rate of interest Find the interest rates earned on each of the following. Round each answer to two decimal places. a. You borrow $680 and promise to pay back $714 at the end of 1 year. % b. You lend $680 and the borrower promises to pay you $714 at the end of 1 year. % c. You borrow $74,000 and promise to pay back $260,323 at the end of 9 years. % d. You borrow $12,000 and promise to make payments of $2,771.70 at the end of each year for 5 years. %