My mother never paid Khums properly though she often paid to charities, without enquiring about Ijazas, and helped needy Syed families. How do I help her calculate how much she should pay?

MotherKhums
My mother never paid Khums properly though she often paid to charities, without enquiring about Ijazas, and helped needy Syed families. How do I help her calculate how much she should pay?
Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 3 years ago

Her yearly savings should be calculated then 20% of every year;s saving must be given as Khums.

Wassalam.