interesting thing I found….Is this just coincidence? In example 4 of your notes in the exercises I made an error and came up with 7 instead of 6 as the d value
However, what i found was that using o.7 instead of 0.6 the N value was of course different but the price of the call option was still 4.36 and therefore the price of the put option was the same as your answer. Is this a rule?