From Australia perspective, S0=AUD0.9860/1USD
F(0,T)=0.9860*(1.04/1.05)=AUD0.9766/1USD
Forward rate=1/1.145=AUD0.8734/1USD
0.8734 < 0.9766, USD is underpriced.
Borrow 1 mil USD,and sell USD for 1 mil * 0.9860 AUD= AUD986,000
One year later,AUD986,000 * 1.04= AUD 1,025,440
Get 1,025,440 * 1.125= USD1,153,620.
profit = USD 1,025,440 - 1 mil * 1.08 = USD73,620


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