What does clicking and dragging the fill handle indicated by the cursor below do?

\begin{tabular}{|c|c|c|c|c|}
\hline \multicolumn{2}{|c|}{[tex]$C 77 \approx$[/tex]} & [tex]$\times \quad \checkmark$[/tex] & [tex]$f x$[/tex] & [tex]$=0.08 * B 77$[/tex] \\
\hline & \multicolumn{2}{|r|}{ B } & \multicolumn{2}{|r|}{ C } \\
\hline 76 & Sale & & Tax & \\
\hline 77 & & [tex]$\$[/tex] 794[tex]$ & & $[/tex]\[tex]$ 64$[/tex] \\
\hline 78 & & [tex]$\$[/tex] 721[tex]$ & & \\
\hline 79 & & $[/tex]\[tex]$ 854$[/tex] & & \\
\hline 80 & & [tex]$\$[/tex] 912[tex]$ & & \\
\hline 81 & & $[/tex]\[tex]$ 1,020$[/tex] & & \\
\hline
\end{tabular}

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