Answer:
Amount of expense to be reported in income statement = 0
Amount of income because of reverse of extra balance = $200
Explanation:
Since the Allowance for Uncollected Accounts is @2% based on percent of sales method, closing balance shall be 2% of credit sales of current year.
Now provided current year credit sales = $140,000
Therefore  Allowance for Uncollected Accounts = $140,000 X 2% = $2,800
Provided existing balance of  Allowance for Uncollected Accounts = $3,000, Therefore it is already in excess of requirement by $200 that is $3000 - $2800 therefore it shall be reversed by $200.
Amount of expense to be reported in income statement = 0
Amount of income because of reverse of extra balance = $200