Please answer question# 22, and Please show work in excel. Thanks.

21. Consider the following project network and activity times in days): SELF test A E Start Finish B D F G Activity A B C D E F G Time 3 2 5 5 6 2 2 The crashing data for this project are as follows: Time (days) Cost ($) Activity Normal Crash Normal Crash A 3 2 800 1400 B 2 1 1200 1900 5 2000 2800 5 1500 2300 E 1800 2800 600 1000 G 2 500 1000 D NOUN 3 3 4 F 22. Refer to Problem 21. Assume that management desires a 12-day project completion time. a. Formulate a linear programming model that can be used to assist with the crashing decisions. b. What activities should be crashed? c. What is the total project cost for the 12-day completion time