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Problem $5\mathrm{.}12($Effective Rate of Interest$)$

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

a$.$ You borrow $$710$ and promise to pay back $$781$ at the end of $1$ year.

$\%$

b$.$ You lend $$710,$ and the borrower promises to pay you $$781$ at the end of $1$ year.

$\%$

c$.$ You borrow $$55,000$ and promise to pay back $$77,391$ at the end of $7$ years.

$\%$

d$.$ You borrow $$16,000$ and promise to make payments of $$5,001,00$ at the end of each year for $5$ years.

$\%$