a. Refer to Figure 17.1 and locate the E-Mini contract on the Standard & Poors 500 Index. If the margin requirement is 20% of the futures price times the multiplier of $50, how much must you deposit with your broker to buy one December contract? (Do not round intermediate calculations.) Required Margin: b. If the December futures price increases to 3,106, what percentage return will you earn on your investment? (Do not round intermediate calculations. Round your answer to 2 decimal places.) Percentage Return: c. If the December futures price falls by 1.3%, what is the percentage gain or loss on your investment? (Input the amount as positive value. Do not round intermediate calculations. Round your answer to 2 decimal places.) _____ of _____ %: