Hi all,

I am struggling with the following:

an investor is considering a call option on the shares of XYZ. the strike price is 510p and the option can only be exercised in exactly 2 months time. at the moment the share price of XYZ is 500p.

in 2 months time the value of the option = Max[shareprice-510,0]

-during the first month the investor believes that the probability the share increases by5% is 0.35, the probability that it increases by 2% is 0.5 and the probability the share falls by 4% is 0.15.

- In The second month the investor believes that the probability the share increases by 4% is 0.3, the probability that it increases by 1% is 0.45 and the probability the share falls by 3% is 0.25

Calculate the price the investor is willing to pay for the option assuming they want to make 3% expected return over the period.

What I did is... I calculate the using a tree graph the expected return that is 11.177 and that is a return of 2.2%.

My problem here is that I need to get the fair price, knowing the expected return... so I need to do exactly the opposite.

What is the formula to do that? and also Can anyone explain how to do that?

Thanks