Suppose the S&P 500 index futures price is currently 1245. You wish to sell 6 futures contracts. Assuming 20% initial margin and that hat the maintenance margin is 80% of the initial margin and the annual effective interest rate is 3%. What is the greatest S&P 500 index future price 1 week from today at which you receive a margin call? Suppose the S&P 500 index futures price is currently 1245. You wish to sell 6 futures contracts. Assuming 20% initial margin and that hat the maintenance margin is 80% of the initial margin and the annual effective interest rate is 3%. What is the greatest S&P 500 index future price 1 week from today at which you receive a margin call