Consider an investment in five S&P 500 Index futures contracts at a price of $924.80. The initial margin requirement is 15.0% and the maintenance margin is 10.0%. If the continuously compounded interest rate is 5.0% what will the futures price need to be for a margin call to occur 10 days from now? Assume no settlement within the 10 days.

A) $852.64

B) $872.79

C) $898.63

D) $905.25

Answer: B (Need help on calculations and also some explanations)