What is the delta of a short position in 1,000 European call options on silver futures? The options mature in 8 months, and the futures contract underlying the option matures in 9 months. The current 9 -month futures price is $$\$ 8$$ per ounce, the exercise price of the options is $$\$ 8$$, the risk-free interest rate is $12 \%$ per annum, and the volatility of silver futures prices is $18 \%$ per annum.