import pandas as pd

orders = pd.DataFrame(
    {
        "order_id": [1001, 1002, 1002, 1003, 1004],
        "customer": ["Ada", "Lin", "Lin", "Maya", "Omar"],
        "total_usd": [150.0, 240.0, 240.0, 875.0, 95.0],
    }
)