Find a and B in the Table Below

Short Answer

Find A and B in the table below.
$$\begin{array} { | l | l | l | l | l | } \hline & & & \text { Simple } & \text { Total Amount } \\\text { Principal } & \text { Interest Rate } & \text { Time } & \text { Interest } & \text { Owed } \\\hline \$ 18,000 & 9 \% & 3 \text { yrs } & \text { A } & \text { B } \\\hline\end{array}$$