Because it is unlikely she will be able to visit you this year, your wealthy American aunt wants to send you a present for your birthday. You expect she will give you USD 8.4 in 1.6 months. Having taken this course, you know you can lock in the AUD rate for this USD receivable using a money market hedge. If (annualized) 1.6-month interest rates in the US are 6.3%-6.4%, 1.6-month interest rates in Australia are 7.9%-8.1%, and the current spot rate is 6.9 AUD/USD, what is the locked in AUD value of this present?

a.57.8453

b.58.0749

c.57.8300

d.1.2150

e.8.4167