A currency dealer is considering trading between Australian dollar $($AUD$)$ and Norwegian Krone $($NOK$).$ A put option allows the holder to sell NOK$400000$ now at an exercise exchange rate of $0\mathrm{.}2540($AUD$/$NOK$).$ If the premium paid is $0\mathrm{.}7$ Australian cents for each NOK, calculate the net payoff at the following spot exchange rates $($in AUD$/$NOK$)$ :

$($a$)0\mathrm{.}2410(2)$

$($b$)0\mathrm{.}2786(2)$

$($c$)0\mathrm{.}1856(2)$

$($d$)$ At what exchange rate will the holder break even?