Insert ten cents at time 20
Insert ten cents at time 30
Insert fifty cents at time 40
Dispensing gum at time 50
Press money back button at time 50
Dispensing ten cents at time 60
Dispensing ten cents at time 70
Insert ten cents at time 80
Press money back button at time 90
Dispensing ten cents at time 100
Testbench finished at time 120