Answer:
Service revenue of $ 440
Explanation:
When the customer prepays, the revenue is yet to be earned hence the entries required would be a debit to cash account and a credit to unearned or deferred revenue.
As the service is rendered and revenue is earned, debit the deferred revenue account and credit the revenue account with the amount earned.
Since $660 was collected for 6 training sessions
Revenue from a training session
= 1/6 × $660
= $110
After 4 training sessions, revenue earned and to be recognized in the income statement
= 4 × $110
= $440