title: Calculate CPU Utilization
body: <p>i have an task to calculate CPU utilization, I have 4 proccess </p>
  
  <p>P1 wait for I/O 30% of his time.</p>
  
  <p>P2 wait for I/O 40% of his time.</p>
  
  <p>P3 wait for I/0 20% of his time.</p>
  
  <p>P4 wait for I/0 50% of his time.</p>
  
  <p>my result is 0.99999993...it seems to me unreasonable</p>