Please help with Excel problems.

Use lookup tables (or equivalent) and values where appropriate so that if something changes (e.g. the Arrival Airport changes), the change is automatically reflected in the output.

\begin{tabular}{l|l|} \hline \multicolumn{2}{|l|}{ Weekday Lookup } \\ Day Number & Day Name \\ \cline { 1 } 1 & Sunday \\ \hline 2 & Monday \\ \cline { 1 - 2 } 3 & Tuesday \\ \hline 4 & Wednesday \\ \cline { 1 - 2 } 5 & Thursday \\ \hline 6 & Friday \\ \hline 7 & Saturday \\ \hline \end{tabular} \begin{tabular}{lc|c|c|c|} & & & & \multicolumn{2}{|c|}{ Ticket Booked X Days Before Travel } \\ Dach & & & Days & Surcharge \\ \hline Oklahoma City & $350.00 & $200.00 & $100.00 \\ \hline Kansas City & $375.00 & $215.00 & 7 & $75.00 \\ \hline DallasfFort Worth & $450.00 & $235.00 & 14 & $25.00 \\ \hline 21 & $ & \\ \hline \end{tabular} \begin{tabular}{l|l|} \hline \multicolumn{2}{|l|}{ Weekday Lookup } \\ Day Number & Day Name \\ \cline { 1 } 1 & Sunday \\ \hline 2 & Monday \\ \cline { 1 - 2 } 3 & Tuesday \\ \hline 4 & Wednesday \\ \cline { 1 - 2 } 5 & Thursday \\ \hline 6 & Friday \\ \hline 7 & Saturday \\ \hline \end{tabular} \begin{tabular}{lc|c|c|c|} & & & & \multicolumn{2}{|c|}{ Ticket Booked X Days Before Travel } \\ Dach & & & Days & Surcharge \\ \hline Oklahoma City & $350.00 & $200.00 & $100.00 \\ \hline Kansas City & $375.00 & $215.00 & 7 & $75.00 \\ \hline DallasfFort Worth & $450.00 & $235.00 & 14 & $25.00 \\ \hline 21 & $ & \\ \hline \end{tabular}