For the two-period (each period is 6 months) binomial option pricing model, So is $50, Su is $52.5 and Sd is $48, and the annual interest rate with semiannual compounding is 6%. Calculate the probability (p) and the stock price moving up in one time step. This is on my sample test and our professor won't provide us with a solution. Every single one of us can't get his answer which is p =.7777. I understand how to make the chart and he "showed work" to get a final formula of P= ((1+r)- d)/(u-d) but I am lost.