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Consider a futures contract that involves 10,000 units of the foreign currency. The initial and maintenance margin requirements are USD 800 and USD 500 respectively. You have established a long position in one futures contract at for = $2 per unit of FX. A few days later the futures price increases $2.20 per unit of FX and you decide to exit the position (sell the long futures contract). What is your rate or turn on invested capital in this trade? to a) 10% b) 2500% Oc) 100% d) 250% e) 25%