Show that the formula in equation (15.9) for a put option to sell one unit of currency

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Show that the formula in equation (15.9) for a put option to sell one unit of currency A for currency B at strike price K gives the same value as equation (15.8) for a call option to buy K units of currency B for currency A at a strike price of 1/5. Strike Price
In finance, the strike price of an option is the fixed price at which the owner of the option can buy, or sell, the underlying security or commodity.
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