def calc_company_check_digit(number):
    """Calculate the check digit for the 10-digit ИНН for organisations."""
    weights = (2, 4, 10, 3, 5, 9, 4, 6, 8)
    return str(sum(weights[i] * int(n)
                   for i, n in enumerate(number[:9])) % 11 % 10)