a. Turn to the Mini-S&P 500 contract in Figure 22.1. If the margin requirement is 10% of the futures price times the contract multiplier of $50, how much must you deposit with your broker to trade the September maturity contract?

b. If the September futures price were to increase to 2,090, what percentage return would you earn on your net investment if you entered the long side of the contract at the price shown in the figure?

c. If the September futures price falls by 1%, what is your percentage return?