In: Finance
Suppose you have $400 in cash in your margin account. You want to buy a stock with 50% margin allowed by your broker and you decide you use full margin. Price of the stock is $10 per share.
Value of position bought = $800
Number of shares bought = 800/10 = 80
After price falls,
Value of position = 80(9) = $720
Margin remaining = 720 - 400 = $320
Margin% = 320/800
Margin% = 40%