Answer:
the operating margin is 5.4%
Step-by-step explanation:
The computation of the operating margin is shown below:
As we know that
 Operating Margin = Operating Income ÷ Sales 
 = $31.3 ÷ $578.3 
= 5.4%
Hence, the operating margin is 5.4%
It could be determined by dividing the operating income from the sales