Answer:
- Operating expenses ⇒ $153,500
Explanation:
Gross Profit;
= Net sales - Cost of Goods sold 
Net sales = Sales revenue - sales discounts - sales returns and allowances
= 807,000 - 6,000 - 10,900
=  $790,100
Cost of Goods sold 
= Opening balance + Purchases + Freight-in - Purchase discounts - Purchase returns and allowances -closing balance
= 56,500 + 509,500 + 4,800 - 8,000 - 2,700 - 66,500
= $493,600
Gross Profit = 790,100 - 493,600
= $296,500
Operating Expense 
Net Income =  Gross profit - operating expenses 
143,000 = 296,500 - operating expenses
Operating expenses = 296,500 - 143,000
= $153,500