The stock price of Apple is $102. You have $10,000 to invest. The monthly interest rate is 0.1%.

Part 1

You think the stock price will go up soon, and want to trade 127 shares. What should you do? Enter 127 for buying 127 shares (on margin if necessary), or -127 for selling or short-selling 127 shares.

Part 2

What is your initial percentage margin (entered as a decimal number)?

Part 3

Two months later, the stock price is $122. What is your percentage margin (entered as a decimal number)?