You buy a share of stock, write a one-year call option with X = $28, and buy a one-year put option with X = $28. Your net outlay to establish the entire portfolio is $26.70. What must be the risk-free interest rate? The stock pays no dividends. (Do not round intermediate calculations. Round your answer to 2 decimal places.) You buy a share of stock, write a one-year call option with X = $28, and buy a one-year put option with X = $28. Your net outlay to establish the entire portfolio is $26.70. What must be the risk-free interest rate? The stock pays no dividends. (Do not round intermediate calculations. Round your answer to 2 decimal places.)