Make this same table using overleaf (LateX). provide me just proper Overleaf (LateX) code.

\begin{tabular}{|l|r|r|r|} \hline \multicolumn{3}{|c|}{ Operational Cost } & \\ \hline \multicolumn{1}{|c|}{ Designation } & Salary & Duration(Months) & \multicolumn{1}{|c|}{ Total } \\ \hline Application Dev & 30000 & 6 & 180000 \\ \hline Blockchain Dev & 30000 & 6 & 180000 \\ \hline UI/UX Desginer & 40000 & 2 & 80000 \\ \hline Operation Manager & 30000 & 6 & 180000 \\ \hline Application Tester & 30000 & 4 & 120000 \\ \hline Total Operation Cost & & & 740000 \\ \hline & Equipment Cost & \\ \hline Item & Unit Price & Quantity & Total \\ \hline Dev Laptop & 50000 & 2 & 100000 \\ \hline UI/UX Laptop & 90000 & 1 & 90000 \\ \hline Mangemnet Laptop & 50000 & 1 & 50000 \\ \hline Tester Laptop & 50000 & 1 & 50000 \\ \hline Total Equipment Cost & & & 290000 \\ \hline Total Development Cost & & & 1030000 \\ \hline \end{tabular}