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Consider a one step binomial model. The initial stock price is S0 = $80. There is...

Consider a one step binomial model. The initial stock price is S0 = $80. There is a 60% chance the stock price will rise to $90, and a 40% chance it will fall to $75. The risk-free interest rate is 5%.
• Identify u and d

• What would the option prices be if the probabilities changed to 70% chance the stock price rises and 30% chance it falls?

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