Davy Jones owns and operates a chain of grocery stores called “Groceries 4 Less.” He is considering a new computer system for accounting and inventory control. A local computer sales office sent the following information about the computer system installation. Activity Predecessor Duration (Weeks A. Select the computer model ~ 6 B. Design input/output system A 8 C. Design Monitoring system A 8 D. Assemble computer hardware B 20 E. Develop the main programs B 18 F. Develop input/output routines C 10 G. Create data base E 8 H. Install the system D,F 2 I. Test and implement G,H 7 a. Construct a network for this problem. b. Identify the critical path by computing the ET, LT, TS, and FS values. c. Determine project completion time.