Answer:
A)
1. Dr Cash 400
  Cr Equipment 400
Dre Wages expense 400
  Cr Cash 400
2. Dr Service revenue 550
  Cr Cash 550
Dr Cash 5,500
  Cr Service revenue 5,500
3. Dr Accounts payable 260
  Cr Equipment 260
Dr Equipment 620
  Cr Accounts payable 620
B)
1. Dr Wages expense 400
  Cr Equipment 400
2. Dr Cash 4,950
  Cr Service revenue 4,950
3. Dr Equipment 360
  Cr Accounts payable 360