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

a. You borrow $740 and promise to pay back $777 at the end of 1 year.

%

b. You lend $740, and the borrower promises to pay you $777 at the end of 1 year.

%

c. You borrow $79,000 and promise to pay back $237,320 at the end of 9 years.

%

d. You borrow $8,000 and promise to make payments of $2,219.30 at the end of each year for 5 years.

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