Why does the Torah need to state the weight of each golden bowl and the sum total of the twelve bowls?
Rashi: To teach us that the bowl was made of gold, but the weight was ten silver Shekalim. 1
Targum Yonasan: Each bowl corresponded to the Aseres ha'Dibros and the combined bowls to the hundred and twenty years that Moshe lived. 2
Rashi: Because otherwise we could have interpreted Asarah Zahav to mean that the bowl was of silver and weighed ten golden Shekalim. Refer also to 7:14:1.1:1.
Nosei Klei Yehonason: Moshe's life was like Ketores for Yisrael. He imparted a good scent to them - Torah, Yir'ah and good Midos (And not that the Nesi'im had Ru'ach ha'Kodesh that he will live until a hundred and twenty, and intended for this - PF.
QUESTIONS ON RASHI
Rashi writes 'Do not say that that the bowl was of silver, and it weighed ten golden Shekalim.' Perhaps it was of gold, and it weighed ten golden Shekalim!
Moshav Zekeinim (in Pasuk 84): TBecause, since the Torah writes "be'Shekel ha'Kodesh", like it wrote with regard to the silver Keilim, just like they were silver Shekalim, so were these. 1
Perhaps it is unreasonable to say that our Pasuk reveals that also the previous Pasuk discusses golden Shekalim (PF).