17.26. A deposit instrument offered by a bank guarantees that investors will receive a return during a six-month period that is the greater of

(a) zero and

(b) 40% of the return provided by a market index. An investor is planning to put $100,000 in the instrument.

Describe the payoff as an option on the index. Assuming that the risk-free rate of interest is 8% per annum, the dividend yield on the index is 3% per annum, and the volatility of the index is 25% per annum, is the product a good deal for the investor?