please do it in 55 minutes please urgently... I'll give you up thumb definitely

Question 3 The table below is an excerpt from the activities of a construction project. The indirect cost attributable to this portion of work is 1500 per day. Preceding activity Activity B D E F G Duration (Days) 3 4 3 1 4 B C E F G,1,J,K G, I, J,K 2 5 5 Normal cost (E) 4000 5000 4800 1800 4000 3600 6000 6000 4200 3000 4300 1200 x-1-10 1 3 3 1 K a) Draw the network diagram using the activity on arrow technique and calculate the overall expected duration of the project by clearly indicating the critical path and event times. (10 marks) b) Calculate the total float and independent float of activities D and L (5 marks) c) Calculate the total cost of this portion of works under "normal" conditions