Find the interest rates earned on each of the following. Round your answers to the nearest whole number.

a. You borrow $700 and promise to pay back $749 at the end of 1 year. %

b. You lend $700, and the borrower promises to pay you $749 at the end of 1 year. %

c. You borrow $66,000 and promise to pay back $144,869 at the end of 6 years. %

d. You borrow $9,000 and promise to make payments of $2,684.80 at the end of each year for 5 years. %