A company uses the cost-of-goods-sold method of reporting lower-of-cost-to-market adjustments to inventory. The company reports the following balances for the first half of the fiscal year:

Month	Inventory at cost	Inventory at market
January	$78,000	$76,000
February	$92,000	$89,000
March	$66,000	$72,000
April	$102,000	$100,000
May	$74,000	$69,000
June	$97,000	$92,000

Which effect does the adjustment of inventory value to market have on the year-to-date cost of goods sold?

The answer is $5,000 increase, but I am wondering how they got it. Please show work.