The initial precedence diagram for a small construction project is shown below with its

planned activity times. At the end of the $12$th day, the field progress report gives you

the following information:

$-$ Activity $\{$A$\}$ was completed on schedule.

$-$ Activity $\{$C$\}$ was completed one day earlier.

$-$ The duration of activity $\{$B$\}$ is $10$ days instead of $6$ days.

$-$ Activity $\{$D$\}$ started as planned but five days were lost due to waiting for the

resources.

$-$ Activity $\{$Y$\}$ cannot start before the end of the $36$th day.

$-$ The duration of activity $\{$H$\}$ will be reduced to $7$ days instead of $17$ days.

$-$ Activity $\{$Z$\}$ is expected to take an additional two days.