Answer:
$0
Step-by-step explanation:
Amount paid by the customer for 100 preferred stock = 100 * $100 = $10,000
Number of preferred stock when converted to common stock = 100 * 2 = 200 shares
Revenue from selling the 200 shares = 200 * $50 = $10,000
Profit or loss to customer = Revenue from selling the 200 shares - Amount paid by the customer for 100 preferred stock = $10,000 - $10,000 = $0
Therefore, the customer made no profit nor loss.