Answer:
57.14%
Explanation:
Missing word "25 percent."
Gain on the stock = (150*$80) - $10,500
Gain on the stock = $ 12,000 - $10,500
Gain on the stock = $1,500
If Margin requirement is 25%, The Margin = 10,500*25% = $2,625
Return on Investment = $1,500/$2,625 * 100 = 0.571429 * 100 = 57.1429% = 57.14%