Answer:
Since there is not enough room here, I prepared the financial statement effects template on an excel spreadsheet that I attached.
a)
January 1, unearned revenue
Dr Cash 30,150
Cr Unearned service revenue 30,150
b)
January 31, accrued services
Dr Unearned service revenue 5,025
Cr Service revenue 5,025
c)
January 31, service revenue from hourly custodial work
Dr Accounts receivable 570
Cr Service revenue 570