Given a call and a put option that are both European options on a stock for which no dividends are payable. Determine the risk-free rate if: (1) The price of the stock is $70. (11) The put option sells for twenty-five cents less than the call option. (111) Both options will expire in 6 years. (iv) Both options have a strike price of $80. You are also given that NO.1875) = 0.57437 N(0.2125) = 0.58414 N(0.3600) = 0.64050 N0.8600) = 0.80500 N(1.75786) = 0.96061 N(1.87786) = 0.96980