The margin requirement on the S&P 500 futures contract is 10% and the stock index is currently 1.800 Each contract has a multiplier of $250 How much margin must be put up for each contract sold? If the futures price falls by 2% to 1.764. what will happen to the margin account of an investor who holds one contract? (Input the amount as a positive value.) What will be the investor's percentage return based on the amount put up as margin? (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) What would be the current cash balance in the margin account