Question $102-104)$ MNCloud company make a small toy. The procedure for manufacturing the small toy include four different processes: Cast, Clean, Drill, and Paint. These below are the time needed to make $12$ units for each process.

Cast: $12$ mins

Clean: $9$ minutes

Drill: $1$ mints and $30$ seconds

Paint: $6$ minutes

a$)$ Please draw the operation chart $($Like Figure $3-3)$ for this.