$10\mathrm{.}19$ When deciding on whether or not to crash project activities, a project manager was faced with the following information. Activities on the critical path are highlighted with an asterisk: $\backslash$table$[[,$Normal,,Crashed$],[$Activity$,$Cost,Duration,,Extra Cost,Duration$],[$ A $,$ $$5,000,4$ weeks, $$4,000,3$ weeks $4060,],[$A$,10,000,5$ weeks,,$3,000,4$ weeks $3660],[$ C $,3,500,2$ weeks,,$3,500,1$ week $3500]]$