FCFS: wait times: P1 0ms, P2 45ms, P3 30ms, P4 5ms
                             (avg: 20ms)
turnaround times: P1 45ms, P2 50ms, P3 45ms, P4 30ms
                             (avg: 42.5ms)

 SJF: wait times: P1 5ms, P2 0ms, P3 30ms, P4 5ms
                             (avg: 10ms)
turnaround times: P1 50ms, P2 5ms, P3 45ms, P4 30ms
                             (avg: 32.5ms)

 RR: wait times: P1 30ms, P2 10ms, P3 15ms, P4 5ms
                             (avg: 15ms)
turnaround times: P1 75ms, P2 15ms, P3 30ms, P4 30ms
                             (avg: 37.5ms)

Preemptive Priority:
     wait times: P1 45ms, P2 0ms, P3 0ms, P4 0ms
                             (avg: 11.25ms)
turnaround times: P1 90ms, P2 5ms, P3 15ms, P4 25ms
                             (avg: 33.75ms)