Three months ago, you bought $100$ shares of Boeing stock when it was trading at $$260$ per share. To finance this purchase, you used $$15,000$ of your own cash and borrowed the rest from your brokerage firm, Robinhood. Robinhood charges you an interest rate of $8\%$ per year on the margin loan and requires a $40\%$ maintenance margin.

What is the stock price of Boeing below which you will receive a margin call?

After the Alaska Airlines incident with a Boeing plane $($a door plug blew off inflight while at $16,000ft$ altitude$),$ the stock price of Boeing dropped to $$200.$ Would you get a margin call, and for how much?

Today, you sold off your Boeing stock holding when the price had recovered a bit from the incident, at $$210.$ Boeing hasn't made a profit in the last few years and as a result hasn't paid out any dividend. What is the holding period return on your Boeing investment?

What is your annualized rate of return $($assuming annual compounding$)?$