Consider a project with the following information.

Activity Immediate predecessors Normal time Crash time Crash cost per period

A $-108$ $$200$

B A $1211$ $$300$

C A $1110$ $$150$

D $-268$ $$240$

E B$,$ C$,$ D $53$ $$260$

What is the total cost of crashing the project by $1$ time unit$($s$)?$is the total cost of crashing the project by $1$ time unit$($s$)?$