Answer: documenting Jin's customer retention rate.
Step-by-step explanation:
In a production chain, a good is said to be complete when it reaches the consumers which are the end users. If Ines who is Jin's sales manager, senses that there has been a slip in Jin's customer retention for the last two months and wants to prevent the trend from continuing, Imes should
document Jin's customer retention rate.
By documenting Jin's customer retention rate, Ines will be able to know if there has been a drop in the consumer retention and if there is, necessary steps will be taken to tackle the issue.