Hello, I'm struggling to work out how to do the working out for these three questions.

A stock price is currently $34. During each three-month period for the next six months it is expected to increase by 8% or decrease by 7%. The risk-free interest rate is 4%. Use a two-step tree to calculate the value of a derivative that pays off (max[(40-S_T),0])² where S_T is the stock price in six months.

a.What are the payoffs at the final nodes of the tree?

b.Use no-arbitrage arguments (you need to show how to set up the riskless portfolios at the different nodes of the binomial tree).

Use risk-neutral valuation.