Hoping for an explanation on one part of this problem:

Execute a margin call of 1000 shares of a stock at $40/share.
The initial margin requirement is 50% and the maintenance margin
requirement is 30%.

I hold for one year, at which time the stock is selling for $50/share
and the stock paid a dividend of $1. The interest rate on the loan was 6%

Calculate the percentage return on investment.

The formula I would use is:

R(t) = [P(t) - P(t-1) + D(t) - Interest(t)] / Initial Investment

And I know the answer is:

[50 - 40 + 1 - 1.2] / 20 = 49%

But I don't understand why the interest is 1.2 instead of .06. What is the reason behind this?

  • Is this homework because this looks like one.
    – DumbCoder
    Oct 8, 2014 at 15:40
  • It is homework. Is that not allowed? I'm just looking for an explanation of how the interest rate is being caculated.
    – MISNole
    Oct 8, 2014 at 18:05
  • 2
    @MISNole It's ok to ask homework questions but it's customary to explicitly state in the question that it's homework. People may provide different context for you!
    – Matthew
    Oct 8, 2014 at 18:17
  • 2
    There is no margin call, you are simply asking about the math of a stock bought on margin. You didn't "Execute a margin call of 1000 shares" you just bought those shares with 50% margin. Would you like to edit or one of us can? Oct 9, 2014 at 0:45
  • 1
    FWIW, A "margin call" is what happens when your position cost (or expected position cost) exceeds the amount you have with the broker. They issue a margin call to you and may liquidate your holdings or lock your account demanding more funds or both.
    – Matthew
    Oct 9, 2014 at 1:35

1 Answer 1


The initial position is worth 40000. You post 50% margin, so you deposited 20000 and borrowed 20000. 6% of 20000 is 1200.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .