Please anwer the following:

Assume that an underlying stock has a current price of $50 and pays no dividends. The risk-free rate is 5% per period, and the stock price follows the following binomial tree: $60 $50 $40 A new derivative: if the stock price goes up, payoff of this derivative is $12.38; $1.27 if the stock price goes down What is the current price of this derivative