Answer:
90%
Step-by-step explanation:
The Customer Retention Rate (or CRR) is the percentage of existing customers who remain customers after a given period.
The CRR can be found by following these steps:
SUBTRACT ---> end - new
DIVIDE ---> result / start
PERCENT ---> show decimal as percentage
The formula looks like this: (E-N)/S, E is end, N is new, S is start