Answer:
January 2, 2020
Dr Accounts receivable 410,000
  Cr Sales revenue 370,000
  Cr Unearned revenue 40,000
Dr Cost of goods sold 300,000
  Cr Merchandise inventory 300,000
Accrual accounting states that revenues must be recognized during the periods that they actually occur (i.e. the earning process is completed). Since the installation process lasts 6 months, the unearned revenue will be recognized as the process is being completed.