If 2 \(kg\) of sugar contains crystals, how many sugar crystals are there in 6 \(kg\) and 6.4 \(kg\)?
(I) 6 kg of sugar contains \(=\) crystals.
[Note: Submit the answer as a whole number].
(II) 6.4 kg of sugar \(=\) crystals.
[Note: Submit the answer as a whole number].