Two processes, p$1$ and p$2,$ arrive at time $0$ and start executing using RR scheduling.

The total CPU time of p$1$ is $50$ time units, and p$2$ is $30.$

The quantum is $Q=10.$

The context switching time, which follows every $Q,$ is $S=1.$

The turnaround time of $p1$ is

The turnaround time of $p2$ is

The average turnaround time, ATT, is