$$a$-$b$)$ Using$$ Johnson's rule for$2-$machine scheduling, the sequence$$ is: Job;Printing $($hours$)$;Binding $($hours$)$

T;$10$;$8$

U;$3$;$4$

V;$6$;$2$

W;$12$;$7$

X;$5$;$1$

Y;$14$;$13$

Z;$9$;$11$

Scheduled Order

Job

$1$

U

Part $2$

$2$

Z

Part $3$

$3$

Y

Part $4$

$4$

T

Part $5$

$5$

W

Part $6$

$6$

V

Part $7$

$7$

X

Part $8$

$$c$)$ For the schedule developed using$$ Johnson's rule, the total length of time taken to complete the seven printing and binding jobs$($including binding$)=$ enter your response here hours $($enter your response as a whole$$ number$).$ D$)$ the idle time in binding shop based on the sequence developed using Johnson's rule : amount of hours?