An assembly line is to operate eight hours per day with a desired output of $180$ units per day. The following table contains information on this product$$s task times and precedence relationships:

TASK TASK TIME $($SECONDS$)$ IMMEDIATE PREDECESSOR

A $80$

B $60$ A

C $80$ A

D $70$ A

E $50$ B$,$ C

F $50$ C$,$ D

G $80$ E$,$ F

H $70$ G

b$.$ What is the required workstation cycle time to meet the desired output rate? $($Round your answer to the nearest whole number.$)$

c$.$ Balance this line using the longest task time. $($Leave no cells blank $-$ be certain to enter $"0"$ wherever required.$)$

d$.$ What is the efficiency of your line balance, assuming it is running at the cycle time determined in part b$?($Round your answer to $1$ decimal place.$)$