$1\mathrm{.}6.$ At an international chocolate emporium, you are considermg the iotlowing chocolate bars:

A $100$ g Frey Milch Extra Fin from Switzerland priced at CHF $2\mathrm{.}20($Swiss Francs$).$

An $200$ g C$$te d'Or L'original Noir$-$Puur from Belgium priced at $2\mathrm{.}99($Euro$).$

A $100$ g Marabou Mj$$lkchoklad from Sweden priced at SEK $30($Swedish Krona$).$

A $1\mathrm{.}55$ oz Hersheys Milk Chocolate from Pennsylvania priced at $$1\mathrm{.}79($U$.$S$.$ Dollar$)$

Which chocolate has the lowest unit cost at today's exchange rates. Recognizing that exchange rates vary, indicate the source of your information and today's date.