Al and Joe Are Two County Sheriff's Deputies Assigned to Watch

Al and Joe are two county sheriff's deputies assigned to watch for traffic violations. Their
arrest and conviction records for May and June are shown below.

$$\begin{array} {c} \quad \quad \quad { \text { May } } \quad \quad\quad \quad \quad{ \text { June } } \\\begin{array} { | l | l | l | l | l | } \hline & \text { Arrests } & \text { Convictions } & \text { Arrests } & \text { Convictions } \\\hline \mathrm{Al} & 90 & 30 & 20 & 12 \\\hline \text { Joe } & 10 & 2 & 80 & 40 \\\hline\end{array}\end{array}$$ Who had the best conviction percentage in May?
Who had the best conviction percentage in June?
Who had the best conviction percentage overall?