Answer:
Strike price of October gold future = $1,200 per ounce
The exercise price = $1,180
To calculate the amount that will help the investor to decide about the position
Amount added to margin = (Strike price - Future price) * Delivery if each contract
Amount added to margin = ($1,200 - $1,180) * 100
Amount added to margin = $20 * 100
Amount added to margin = $2,000
Therefore, the amount of $2,000 is received. The investor has short position on future contracts to sell 100 ounces of gold in October.