A: 1. You have to pay zakaat on gold and silver, which must be calculated according to current gold and silver prices.
2. Once you have the value of the gold and silver in rands, add that to any cash money that you have.
3. Now calculate 2.5 percent of the total amount, then multiply the answer by three. That will give you your zakaat for the past three years.
Note: The above method is a simple and straighforward method of calculating zakaat for past years and your zakaat will be discharged.
And Allah knows best