Wesfarmers Limited (WFS) is an Australian company with diverse holdings, including retail, industry, etc.. It is Australia's largest private employer. Currently (i.e., t = O), WFS shares are trading at $48.17. You wish to purchase a European put on WES shares, with strike price $50.00, expiring after two time steps. Consider a two-step binomial model, with variable returns: = 1.035 , R(l, 1) = 1.025 and = 1.045. Using CRR notation, assume (a) (b) (c) (d) (e) (f) 1.14 and d = l/u. Calculate the risk neutral probabilities 7(0, O), 7(1, 1) and (If you wish, you may present these results in a binomial pricing tree). Construct a two-step binomial pricing tree for the European put. A European call has the same strike price, underlying asset and time to expiry as the European put. Construct a two-step binomial pricing tree for the European call. Construct the two-step binomial pricing tree for the present value of the strike, that is, find all PV(no) (K) in the two-step model. When we have variable interest rates, the present values of the strike at different nodes can be calculated using the generalised binomial pricing formula, with the present value at expiry N = 2 equal to the strike, PV(20) (K) = K for all Put-call parity still holds when interest rates are variable, Show that put-call parity holds for your values of the put, the call, and the present value of the strike, at every node of the two-step binomial model. Given that O) = 1, calculate all state prices at the put's expiry, 2) , 1) and O). Remember that when when interest rates are variable, you cannot write the state prices directly, rather you should calculate them iteratively. Use the state prices with j O, 1,2 to calculate the premium of the European put and confirm that it agrees with the premium obtained from the binomial pricing tree in part (b).