Find the interest rates earned on each of the following. Round your answers to the nearest whole number a. You borrow $720 and promise to pay back $792 at the end of 1 year. b. You lend $720 and the borrower promises to pay you $792 at the end of 1 year. c. You borrow $55,000 and promise to pay back $100,543 at the end of 7 years. d. You borrow $9,000 and promise to make payments of $2,684.80 at the end of each year for 5 years