The margin requirement on the S&P 500 futures contract is 8%, and the stock index is currently 1,900. Each contract has a multiplier of $250. a. How much margin must be put up for each contract sold? MarginS b. If the futures price falls by 1% to 1,881, what will happen to the margin account of an investor who holds one contract? input the amount as a positive value. Margin account (Click to select)by c-1. What will be the investors 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