$".($AUD$)($HKD$).$ AUD $$ HKD $$ HKD $$ AUD $12,""(4)$

$(1$ AUD $557$ HKD$)$

$1$ HKD $$ AUD $$

AUD $$ HKD $2$

$[]$

$?$

$[]$

$ $30000$ AUD $$$$16710...$

$$:

convert $=(""$HKD $$ AUD $1$

AUD $$ HKD $2$

$")$

$===1$:

$=("?$

$"))$

$(\text{'}$$$\text{'}\text{'}$HKD $$$$\text{'}/557$ 'AUDSay $)$

$=2$:

$=("?$

$"))$

$(\text{'}$$$\text{'}()$ 'AUD $$$$\text{'}()*557$ 'AUD$"$BD$16$