What is your recommendation for this training based on the expected return on investment? Should just the group with the most re-cleanings be trained or should both groups be trained? Provide a...

What is your recommendation for this training based on the expected return on investment? Should just the group with the most re-cleanings be trained or should both groups be trained? Provide a rationale for your recommendation that includes both the financial as well as other factors that may be important in making this decision. Show any mathematical calculations used.