Assume securities J and K have the following payoffs, respectively: Security State 1 State 2 J $10 $20 K $30 $10 An investor has $756 to invest. Security J is currently selling for $8 per share while Security K is currently selling for $9 per share. Assume that states 1 and 2 have the same likelihood of occurring. a) If the investor wants to have a risk free portfolio, how many shares of J and K, respectively. should be purchase? b) Find the risk-free rate of retum