The Twelve Tasks Necessary to Assemble a Food Blender Are

The twelve tasks necessary to assemble a food blender are listed below. The time to perform each task and the tasks that must immediately precede are also listed. 200 blenders are needed per hour and 50 minutes per hour are productive:
$$\begin{array} { c c c | c c c } \text { Task } & \text { Time in minutes) } & \text { Predecessors } & \text { Task } & \text { Time in minutes) } & \text { Predecessors } \\\hline \text { A } & .20 & \text { none } & \text { G } & .08 & \text { E,F } \\\text { B } & .05 & \text { none } & \text { H } & .12 & \text { none } \\\text { C } & .15 & \text { none } & \text { I } & .05 & \text { none } \\\text { D } & .06 & \text { none } & \text { J } & .12 & \text { H,I,G } \\\text { E } & .03 & \text { A,B } & \text { K } & .15 & \text { J } \\\text { F } & .16 & \text { C,D } & \text { L } & .08 & \text { K } \\\hline\end{array}$$
a. Compute the cycle time per unit in minutes.
b. Compute the minimum number of workstations required.
c. Use the longest-task-time heuristic to balance the assembly line.
d. Compute the efficiency of your assembly line.