Final answer:
To calculate the European-style call option value, we can use put-call parity formula. However, since the question does not provide information about dividends, it is not possible to calculate the specific value.
Step-by-step explanation:
Joel Franklin is observing an American-style option and a European-style option with the same strike price, expiration, and underlying stock. He believes that the European-style option will have a higher premium. To calculate the European-style call option value, we can use put-call parity formula:
European Call Option Value = American Call Option Value - Present Value of Dividends
Solving for the American Call Option Value:
American Call Option Value = European Call Option Value + Present Value of Dividends
The present value of dividends can be calculated using Treasury bill rates and the time to expiration. However, the question does not provide information about dividends, so it is not possible to calculate the specific European-style call option value.