Answer:
$260
Explanation:
The computation is shown below:
There is $390 for a package of six physical training sessions
So for one package, it would be
= $390 ÷ 6
= $65
For four training sessions, the service revenue would be
= $65 × 4 training sessions
= $260
The service revenue is $260
And the unearned service revenue, it would be
= $390 - $260
= $130