Which expression can be used to convert 80 us dollars (usd) to australian dollars (aud)?

1 usd = 1.0343 aud
1 aud = 0.9668 usd

80 u s d times startfraction 0.9668 u s d over 1 a u d endfraction
80 u s d times startfraction 1.0343 u s d over 1 a u d endfraction
80 u s d times startfraction 0.9668 a u d over 1 u s d endfraction
80 u s d times startfraction 1.0343 a u d over 1 u s d endfraction

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