12. Problem 5.12 (Effective Rate of Interest) eBook Find the interest rates earned on each of the following. Round your answers to the nearest whole number. a. You borrow $690 and promise to pay back $759 at the end of 1 year. b. You lend $690 and the borrower promises to pay you $759 at the end of 1 year. 9 C. You borrow $77,000 and promise to pay back $738,927 at the end of 13 years. % d. You borrow $18,000 and promise to make payments of $4,390.00 at the end of each year for 5 years. 9%