Answer:
$22,020
Explanation:
Given, (Before Adjustment)
Unearned Service Revenue $6,600 
Service revenue $17,190
The adjusting entry to record the expired unearned revenue is
Debit     Unearned Service Revenue     $4,830
Credit          Service revenue                   $4,830
Therefore, the amount of Service Revenue Earned to be reported in the March income statement is as follows:
Service revenue before adjustments              =   $17,190
<u>Unearned Service Revenue earned in March =  $4,830 </u>
Service revenue after adjustment                 = $22,020