Refer to the Mini-S\&P contract in Elgure 221. Assume the closing price for this day. a. If the margin requirement is 25% of the futures price times the contract multiplier of $50, how much must you deposit with your broker to trade the March maturity contract? (Round your answer to the nearest Whole dollar.) b. If the March futures price increases to 2603.70, what percentage return will you earn on your inyestment if you entered the long side of the contract at the price shown in the figure? (Do not round intermediate calculations. Round your answer to 2 decimal places.) c. If the March futures price falls by 1%, what is your percentage return? (Negative amount should be indicated by a minus sign. Do not round intermediate calculations. Round your answer to 2 decimal places.)