Final answer:
The percentage of customers likely to spend more if the sales associate is helpful can be determined through customer surveys or studies on customer behavior and spending patterns.
Step-by-step explanation:
The question is asking about the percentage of customers that are likely to spend more if the sales associate is helpful. This falls under the subject of Business, specifically customer behavior and satisfaction.
In order to determine the percentage, we would need data from customer surveys or studies that measure customer behavior and spending patterns. For example, a study may find that 80% of customers who reported receiving helpful assistance from a sales associate were more likely to spend additional money compared to those who did not receive assistance.