Consider multilevel queue scheduling where four queues are present. Queue 1 takes processes with priority values 1-5, queue 2 takes processes with priority values 6-12, queue 3 takes processes with priority values 13-20 and queue 4 takes rest of the processes. Queue 1 uses round robin scheduling with time quantum 4 and queue 2 uses round robin scheduling with time quantum 5. Queue 3 and 4 use FCFS. Draw the gantt chart and calculate average waiting time for the processes shown in the following table