What is the amount of zakat due on 126,500 Saudi Riyals that was collected over three years and two months with the intention of purchasing land, and on which zakat was not paid during that period?

Zakat for past years must be paid when the nisab (minimum threshold) is met and a full lunar year has passed. The more cautious and debt-discharging approach is that zakat becomes an obligation (wajib) on the individual, calculated by taking one-quarter of one-tenth (2.5%) of the total amount possessed each year. For example, if the amount was 32,000, its zakat is 800. If 33,500 is added, the total becomes 65,500, and its zakat is 1637.5. With the addition of 40,000, the total becomes 105,500, and its zakat is 2637.5. In this example, the total amount that must be paid is 5075. If one pays the zakat for the first year and subtracts it from the zakat of the second year, and so on, considering that zakat is due on the principal amount itself, that would be sufficient.