"This coffee becomes sweet with the addition of sugar."

Translation: Kopi ini menjadi manis dengan tambahan gula.

[doug438513]

Kopi ini menjadi manis dengan penambahan gula. could somebody explain to me why this is wrong.
I believe that Penambahan means with the addition of as opposed to tambahan which means with added ?

[Anno552538]

I am not sure the position of tambahan. The other sentence is using tambahan as adjective (catatan tambahan).
Gula tambahan = additional sugar
Tambahan gula = addition of sugar?