How is rent calculated for Social Housing tenants?

How is rent calculated for Social Housing tenants?
IncomeRate
TENANT and LIVE IN PARTNER25%
Other Household Members 21yrs and over25%
Other Household Member – 18 yrs – 21yrs
(Unless Primary Tenant or Partner in which case 25%)
15%
Other Household Members aged 18 yrs and under
(Unless Primary Tenant or Partner in which case 25%)
0%
Family Tax Benefit Part A and Part B15%
Maintenance25%
All other income25%
Total Households entitlement to Rent Assistance100%