5. Suppose you buy one gold futures. A gold future has 100 troy ounces, and each ounce is currently selling for $1,900. Your initial margin is 10% and the maintenance margin is $14,000. Suppose you pay interest of $500 on the amount of margined funds. Given this, if the gold price increases to $1,950 per ounce, what is the percentage return on your investment? a. 26.3% b. 22.5% c. 2.6% d. 23.7%