you purchase 300 shares of square enix at $40 per share. To pay the purchase, you borrow $4000 from broker
Total worth of shares bought = 300*40 =12000
As you borrowed 4000, your initial margin is 8000/12000 = 66.67%
When share peice falls, the worth of investments become 30*300 = 9000.
In 9000 you had borrowed 4000 so you have equity of 5000.
Had your equity fallen below 9000*0.3=2700 then you would have received a margin call. Here as your equity is more than 2700, you won't receive a margin call. (Assumption is no interest charged on loan).
The loan amount plus interest you would have to pay the broker = 4000*1.05 = 4200
When you sell at 30 you get 9000, from which you payback 4200. Hence, you are left with 4800. You had invested 8000. So, your return becomes
(4800/8000)-1 = 0.6-1 = -0.4
Hence you get a return of -40% during the period.
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