Add all the three items together and give their Zakah

If a person is having 80gms of gold and 550gms of silver and about 700 SR in cash. How can we know that he is eligible for Zakah? Moreover, if he is/not eligible for Zakah. Please guide us how to calculate/analysis the financial condition.

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions. 80 grams of gold alone is not enough to amount the Nisab (amount of money, jewelry, etc., determined for Zakah to be due). 550 grams of silver alone do not reach the Nisab either. The same thing can be said about the 700 Riyals. He who owns such wealth on which one full year elapses, has to combine them together. If all these items of wealth are altogether equal to 85 grams of gold, then he has to pay the due share of Zakah which is 2½ %. Allah knows best.