The Office Interiors Company has developed a new, modern office chair. Initial sales forecasts are for 48 chairs per day. Th assembly operations will run for two 8-hour shifts. The process engineer and operations manager are working together to balance the line to make the new chair as efficiently as possible. The process engineer suggests using the longest operating time rule while the operations manager suggests using the most number of followers rule to design the line. If there is a tie, use the other rule to break the tie.
task time (minutes) predecessors
A 10 -
B 14 A
C 4 B
D 15 -
E 8 C, D
F 10 -
G 5 F
H 12 E,G

a. Calculate the efficiency for each rule.