Stochastic methods in finance - option pricing

Question as below:

Alex is looking to price a 6-month European put option with a strike price of $29 on a share in Omni Consumer Products (OCP). The current price for an OCP share is $30. Alex has used past data and his own judgement to estimate the volatility of these shares to be 15% per annum. The risk-free continuously compounding interest rate is 5% per year. a) Construct a 3-step binomial tree showing the possible share prices over the next 6 months. Also, clearly show the corresponding probabilities for an upward and a downward movement in the share price. As a check, the numbers 26.5419 and 31.8945 should appear in your tree. b) Using your binomial tree from part a) and the information given above, calculate the corresponding 3- step tree containing the corresponding option values, and clearly state the fair price of the option according to the given information. As a check, the numbers 0.1537 and 0.7820 should appear in your tree. c) Using the binomial tree constructed in part b), estimate the time zero (t = 0) values of delta (4), theta (0), and gamma (D) ONLY. You do NOT need to calculate nu (v) and rho (p)