The margin requirement on the S&P 500 futures contract is 8%, and the stock index is currently 1,700. Each contract has a multiplier of 5 $50. a. How much margin must be put up for each contract sold? Margin b. If the futures price folls by 2% to 1,666, what will happen to the margin account of an investor who holds one contract? (Input the amount as a positive value.) Margin account by c-1. 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.) Percentage return % c-2. What would be the current cash balance in the margin account? Cash balance