Answer:
Option (E) is correct.
Step-by-step explanation:
Let number of unit produced be "X" 
 
Variable selling expense = 0.04 × X × 500 
 = 20X 
 
Net operating income = Gross margin - Fixed selling - variable selling 
 2,000,000 = GM - 2,000,000 - 20X 
 Gross margin = 2,000,000 + 2,000,000 + 20X 
 = $4,000,000 + 20X 
 
Unit produced (Selling price - Cost of goods sold) - Fixed overhead = Gross margin 
 X ($500 - $200) - 12,000,000 = 4,000,000 + 20X 
 300X - 20 X = 4,000,000 + 12,000,000 
 280X = 16,000,000 
 X = 16,000,000 ÷ 280 
 = 57,142.86 units
Hence, this much units need to be produced for inventory to meet the target.