Calculate the value of a call option.

A stock through Apple is currently priced at $50. Bobby and Christine both believe the stock will go up 20% one year or it will go down 20% one year from now ($60 or $40). Bobby believes the probability of the stock going up to $60 one year from now is only 70%, while Christine believes the probability that it will go up to $60 in a year which is only 30%. If the risk free rate of return is 3.5%, what is the value of the call option one year from now?