Based on the Income Statement information below, what is the 2019 Gross Margin? 4 Year ending Dec 31, 2019 Gross Sales $860,000 Returns and Allowances $10,000 Cost of Goods Sold $510,000 Operating Expenses $110,000 Administrative Expenses $55,000 General Expenses $40,000 $340.000 $100000 $135.000 O $850,000 O$860,000