a. Consider a company that produces a given article, through a set of operations with the precedence indicated in the table (daily work of 8h).

Construct the circulation graph of an in-line deployment (sequential posts) that shows the highest possible efficiency, without considering the single post hypothesis.

Operation	Op. time	Precedences
A	1	-
B	1,2	A-
C	0,6	B
D	1,2	C
E	0,8	D
F	1,4	E
G	1,6	F
H	0,2	G
I	0,6	H
J	1,2	I
K	1,2	J
L	1	K

b. Assume that a given improvement proposal involves an investment of $5,000, the hiring of an additional specialized operator paid at $5/hour and an increase in energy consumption by an additional $1/hour. Knowing that the gain per hour with this improvement is $10/hour, determine after what number of working hours the investment becomes viable.