MadeEasy Workbook: Operating System - Process Schedule

Question

How to solve this question? 

Example-3.22 Consider the following information of each process with arrival times att their execution times of CPU and I/O. FCFS is used to schedule CPU and I/O jobs.
\begin{tabular}{|l|l|l|l|l|l|l|}
\hline Process & Arrival time & 1st exec & 1st. I/O & 2nd exec & 2nd I/O & 3rd exec \\
\hline A & 0 & 4 & 4 & 4. & 4 & 4. \\
\hline B & 2 & 8 & 1 & 8 & - & - \\
\hline C & 3 & 2 & 1 & 2 & - & - \\
\hline D & 7 & 1 & 1 & 1 & 1 & 1 \\
\hline
\end{tabular}

Compute the Processor utilization, Throughput, Average waiting time and Average turn around time.

Comments

Thy r asked in gate ( similar to this question )

https://gateoverflow.in/1843/gate2006-65

https://gateoverflow.in/3597/gate2006-it-54

check them ... again you have any doubt let me know.