Question 3 1 pts A stock price is currently $30. During each two-month period for the next four months it is expected to increase by 8% or decrease by 10%. No dividend payment is expected during these two periods. The risk-free interest rate is 5% per annum. If you use a two-step tree to do the valuation, what, to the nearest cent, is the value of a European put option with a strike price of $32 that expires in four months? Question 4 1 pts In question 3 above, what, to the nearest cent, is the value of a American put option with a strike price of $32 that expires in four months? (Your answer should be in the unit of dollar, but without the dollar sign. For example, if your answer is $1.02, just enter 1.02.) Question 5 1 pts The volatility of a stock is 0.3 per annum. In a Cox-Ross-Rubinstein binomial tree in which one step represents a time interval of 3 months, what are the proportional up-movement and down-movement factors, u and d, respectively