\begin{table}[htp] 
\centering \caption{\label{tab1} \footnotesize ؟}
\begin{tabular}{| c | c | | c | c |}
\hline
\i & \sum\limits_{i=1}^{5}A_{i} & \sum\limits_{i=1}^{5}B_{i} & \frac{\sum\limits_{i=1}^{5}A_{i}}{\sum\limits_{i=1}^{5}B_{i}} & \frac{A_{i}}{B_{i}}\\&&
\hline
$ 1$ & $1$ & $1$ & $0$ & $0$ \\
\hline
$ 2$ & $2$ & $1/2$ & $0$ & $0$ \\
\hline
$ 3$ & $1$ & $3/4$ & $1/2$ & $3$ \\
\hline
$ 4$ & $5$ & $6$ & $1$ & $4$\\
\hline
\end{tabular}
\end{table}\\