Which expression can be used to convert 22 Australian dollars to US dollars? Assume 1.2 Australian dollars equals 1 US dollar.
$22 AUD × 1.2 USD/1 AUD
$22 AUD × 1 USD/1.2 AUD
$1.20 AUD × 1 USD/1.2 AUD
$1.20 AUD × 1.2 USD/1 AUD