4. Problem Solving A shop works a 400-minute per day. The manager of the shop wants an output of 200 units per day for the assembly line that has the elemental tasks shown in the table. Do the following: Task Immediate Predecessor Task Time a b d e f 0.5 1.4 1.3 0.7 0.5 1 0.6 0.4 0.7 0.9 1 0.5 a a,b a.c bc db d,e B hf e,i ht k 8 h 1 k m a) Construct the precedence diagram (4 points) b) Assign tasks to stations according to the most following tasks rule. Break ties with the greatest positional weigt rule. (positional weights: task time plus the sum of all following times) (16 points)