Use the binomial method to determine the value of an American Put option at time t = 0. The American Put option expires

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Use the binomial method to determine the value of an American
Put option at time t = 0. The American Put option expires at
time t = T = 3 and has exercise price E = 10. The current
value of the underlying is S(0) = 10 and the
interest rate is r = 0.05. Use a time step δt = 1. Consider
the case of p = 1/2 and suppose the volatility σ = 0.4.
Perform all calculations using a minimum of 4 decimal
places of accuracy.