a. You borrow $700 and promise to pay back $770 at the end of 1 year. % b. You lend $700 and the borrower promises to pay you $770 at the end of 1 year. % C. You borrow $91,000 and promise to pay back $214,574 at the end of 9 years. % d. You borrow $20,000 and promise to make payments of $6,687.60 at the end of each year for 5 years. %