Problem $4-12($Static$)$

The following table represents a plan for a project:

TIMES $($DAYS$)$

JOB NO$.$ PREDECESSOR

JOB$($S$)$ a m b

$1234$

$21123$

$314512$

$413411$

$52135$

$63123$

$74189$

$85,6246$

$982412$

$107345$

$119,10578$

b$.$ Indicate the critical path.