The following is a table of activities associated with a project at Rafay Ishfaq's software firm in Chicago, their durations, what activities each must precede and the crash cost to reduce duration per week: \begin{tabular}{cccc} \hline Activity Duration (weeks) & Precedes & Crash Cost/Week \\ \hline A (start) & 3 & B, C & $370 \\ B & 2 & E & $120 \\ C & 5 & F & $200 \\ E & 2 & F & $150 \\ F (end) & 3 & - & $420 \\ \hline \end{tabular} \begin{tabular}{cc} \hline EachActivityShouldbeReducedBY(weeks) \\ \hline A & week(s) \end{tabular}