Binomial tree to price option Part 9

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Using binomial tree to value american and european call and put options
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e^-rT is discounting by the continuously compounded rate.

it is the same as dividing the rest of the formula by e^rT

SourChews
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I don't understand why we multiply e^-rT so as to discount back to the option value 24.15 . How does this come from? Does it come from any formula?

stevenkml