answer is 3.68625%

(8.9) Using replicating portfolios to price options (1) Easylife stock currently sells for $23.80 per share. Three months from now, the price will either have gone up to $25.20 or have fallen to $22.20. A call option to purchase 100 shares of the stock in three months for $24 per share sells for $72. With what risk-free annual effective rate of interest is this consistent, if there is to be no arbitrage opportunity