Required: , a. Refer to Eigure 171 and locate the E-Mini contract on the Standard \& Poor's 500 Index. If the margin requirement is 25% 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.) b. If the December futures price increases to 3,108 , what percentage return will you earn on your investment? (Do not round intermediate calculations. Round your answer to 2 decimal places.) c. If the December futures price falls by 1.4%, what is the percentage goin or loss on your investment? (Input the amount as positive value. Do not round intermediate calculations. Round your answer to 2 decimal places.)