What is the value of a derivative that pays off $$\$ 100$$ in 6 months if an index is greater than 1,000 and zero otherwise? Assume that the current level of the index is 960 , the riskfree rate is $8 \%$ per annum, the dividend yield on the index is $3 \%$ per annum, and the volatility of the index is $20 \%$.