PM$\mathrm{.}61$ Rob Smith is managing a small project at Boston University. He is under pressure to shorten the overall duration of the project by $4$weeks$$and he wants to do so at the lowest cost possible. In order to meet this objective a number of activities must be crashed.$$

$$ Activity$$ Normal Time $($weeks$)$ Crashed Time $($weeks$)$ Normal Cost$$ Crashed Cost$$ Predecessor$($s$)$A$53$$$800$$$1,400-$B$65$$$400$$$500-$C$65$$$550$$$775-$D$32$$$900$$$1,100$AE$53$$$1,350$$$1,950$CF$63$$$750$$$1,650$B

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What is the duration of the project $($in weeks$)?$

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Incorrect

Your Answer:$21$

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What is the target duration of the project $($after crashing the project$)?$

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Incorrect

Your Answer:$17$

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By how many weeks should activity A be crashed?$$

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By how many weeks should activity B$$be crashed?$$

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By how many weeks should activity C$$be crashed?$$

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By how many weeks should activity D$$be crashed?$$

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By how many weeks should activity E$$be crashed?$$

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By how many weeks should activity F$$be crashed?$$

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What is the total cost of crashing the project $4$ weeks $($just the additional cost, not total project cost$)?($Display your answer to two decimal places.$)$

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