You receive a message from the future: "Help! Our sales have plummeted, but we don’t know why! The answer lies in our past data."
You have a time machine that can take you back to any point in time to observe the data of that period, but it can only make 3 trips.
Describe your approach to unravel the mystery. Which three points in time would you choose to visit, and what data would you examine to diagnose the potential cause of the future sales drop?