Subscription income for 2021-22 is computed as:
Received during the year: 1,00,000
Less: Outstanding of 2020-21 received this year: (10,000)
Add: Outstanding for 2021-22: 20,000
Add: Advance received in 2020-21 pertaining to 2021-22: 5,000
Less: Advance received in 2021-22: (4,000)
=1,00,000−10,000+20,000+5,000−4,000=1,11,000.