單人公屋係幾多收入先需要交額外租金?

單人59歲的公屋住房,幾多收入先需要交額外租金?
https://www.housingauthority.gov.hk/tc/common/pdf/public-housing/tenancy-matters/income-and-asset-declaration/HD1120(4-2025)%20c.pdf
呢到睇到唔係好肯定