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A company sells their furniture for $130$ euro. There are $480$ minutes available during the day and average daily demand has been $50$ chairs. There are $8$ tasks.

Task Assembly time $($minutes$)$ Preceded By

A $4$

B $7$

C $6$ A$,$B

D $5$ C

E $6$ D

F $7$ E

G $8$ E

H $6$ F$,$G

what is the idle time per cycle?