Balance the assembly line shown below for $($a$)$ a shift output of $30$ pieces and $($b$)$ a shift output of $20$ pieces. Assume an $4-$hour shift, and use the rule: choose the assignable task with the longest processing time. Compute the line efficiency for each case.

a$.$ Fill in the table below for a shift output of $30$ pieces. Break ties by choosing the lowest task number. if your answer is zero, enter $"0",$ Round your ansmers to the nearest whole nu$-$ber.

$\backslash$table$[[$Workstation$,$Tasks,Total Time$],[1,,],[2,,],[3,-$Select$-7,],[4,-$ Salect$-9,],[,$Total,$]]$

What is the assembly$-$Ine effidency? Round yoir answer to ane decima plase.

b$.$ Fill in the table below for a shift output of $20$ pieces, break ties by choosing the lowest task number: If your anower is zero, erter $"0".$ Round your answers to the nearest whole number.

What is the assembly line efficiency? Round your answer to one decimal place.