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

A$.$ you borrow $$660$ and promise to pay back $$693$ at the end of one year. $-\%$

B$.$ you lend $$660,$ and the borrower promises to pay you back $$693$ at the end of one year. $-\%$

C$.$ you borrow $$79,000$ and promised to pay back $$407,623$ at the time of the end of nine years. $-\%$

D$.$ you borrow $$16,000$ and promise to make payments of $$5,001\mathrm{.}00$ at the end of each year for $5$years. $-\%$