You are pricing a derivative using the risk-neutral approach on a Binomial tree.

The length of each branch in the tree (delta t) is 9 months.

The riskfree rate of interest is 5% per annum.

The proportional up movement in stock price is u = 1.1.

Calculate the risk-neutral probability (p*) that share price will move up.

Note: if the probability is (say) 51.23%, enter 0.5123