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

You borrow $$720$ and promise to pay back $$756$ at the end of $1$ year.

$\%$

You lend $$720,$ and the borrower promises to pay you $$756$ at the end of $1$ year.

$\%$

You borrow $$81,000$ and promise to pay back $$114,901$ at the end of $6$ years.

$\%$

You borrow $$14,000$ and promise to make payments of $$3,693\mathrm{.}20$ at the end of each year for $5$ years.

$\%$