For this problem, identify $P,FV,$I,$r,n,$ and $t.$

$10$ years ago, Sandra invested $$1,800\mathrm{.}00$ in a CD that earns $2\frac{5}{8}\%$ compounded quarterly. She earned a total of $$538\mathrm{.}31$ in interest.

What is $P?$ Round to the nearest cent.

What is $FV?$ Round to the nearest cent.

What is I $?$ Round to the nearest cent.

What is $r?$ Enter your answer as a decimal.

What is $n?$

What is $t?$ Answer in years.