$4.$ Freddie is an option speculator. He anticipates the Danish kroner to appreciate from its current level of $$\mathrm{.}19$ to $$\mathrm{.}21.$ Currently, kroner call options are available with an exercise price of $$\mathrm{.}18$ and a premium of $$\mathrm{.}02.$ Should Freddie attempt to buy this option? If the future spot rate of the Danish kroner is indeed $$\mathrm{.}21,$ what is his profit or loss per unit?