Welcome to your interview.
The question is on your right: Diagnose 20% CAC Increase. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
If our marketing acquisition costs (CAC) for a specific product increased by 20% week-over-week, what steps would you take to diagnose the root cause?