The stock price of Google is $589. You have $10,000 saved in a savings account. The monthly interest rate is 0.2%.

You think the stock price will go down soon, and want to trade 20 shares. What should you do? Enter 20 for buying 20 shares (on margin if necessary), or -20 for selling or short-selling 20 shares.

If the initial margin is 50%, what is the minimum additional dollar amount that you have to deposit in your brokerage account?

What is your initial percentage margin (entered as a decimal number) once you've completed the deposit calculated in part 2?

Two months later, the stock price is $609. Google paid a dividend of $7 per share just before the two months were over. What is your percentage margin (entered as a decimal number)?