def sum_two_to_2020_product(expense_report_entries):
    """Find the product of the two entries in the expense report that sum to 2020."""
    for i, entry in enumerate(expense_report_entries):
        for j in range(i + 1, len(expense_report_entries)):
            if entry + expense_report_entries[j] == 2020:
                return entry * expense_report_entries[j]

    return None