Twenty-eight mithqals: eight above the initial twenty, or two complete four-mithqal blocks. The due is 0.7 mithqal.
Thirty-two mithqals: twelve above twenty, or three blocks. The due is 0.8 mithqal.
Both amounts consist of complete increments, so the disagreement over fractions does not arise.
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Zakat on Gold: Nisab, Incremental Dues and Jewelry
Twenty-eight mithqals: eight above the initial twenty, or two complete four-mithqal blocks. The due is 0.7 mithqal.
Thirty-two mithqals: twelve above twenty, or three blocks. The due is 0.8 mithqal.
Both amounts consist of complete increments, so the disagreement over fractions does not arise.