Identify the critical path and compute project duration

Following are elements of a WBS for a project to build a bunk bed. Using the information supplied here, create a WBS and carry out a bottom-up cost estimate.
——————————————Cost ($)———-Rate ($/hr)——Time (hr)
Research—–Jimmy’s time—————————–1———————–2
——————-Dad’s time——————————–25———————2
Materials——-Lumber—————200
——————-Hardware————-45
——————-Power Equipment–65
——————-Jimmy’s time to get material———–1———————3
——————-Dad’s time to get material————–15——————–3
Construction–Jimmy’s time——————————–1——————–8
——————-Dad’s time———————————–20——————-8
Inspection—–Mom’s time———————————-10——————-0.5

2) Following is a listing of items to be considered in costing a PC game development project. Use this data to develop a parametric estimate of the cost of the project.

———————————————Cost ($)——-Rate ($/hr)——Time (hr)
Resources—–Designers——————————30———————100
———————Artists———————————-25———————-200
———————Programmers————————25———————1000
———————Work station———3000
———————Contracted testing——————50———————–100
———————Marketing Material-1500
Fringe benefits: 30% of Direct Wages
Overhead: 70% of (Direct Wages + fringes)

3) For the table below
Task—Predecessor—–Duration—-Latest start—–Earliest Start—–Float(slack)
A———-start—————-5
B———-A,D—————–8
C———-B——————–9
D———-start—————-6
E———-D——————–12
F———-start—————–12
G———-F———————7
a)Create a PERT/CPM chart
b)Identify the critical path and compute project duration
c)Compute Latest Start, Earliest Start, and Float (Slack