$3.$ T$-$Rex Company based in the U$.$S$.$ usually buys raw materials from an Australian supplier. How much would the order be in U$.$S$.$ dollars if the invoice is for $$15,450\mathrm{.}00$ AUD? $4.$ T$-$Rex Company is looking for alternative suppliers in Japan. The supplier's quote is for $1,355,190$ JPY$.$ What would this be in U$.$S$.$ dollars? Which supplier should T$-$Rex buy from, the Australian or Japanese?