According to January $16$th issue of the Economist, the current price of Big Mac in US is around $$3\mathrm{.}8,$ while the price of Big Mac in Japan is around JPY$320.$ The current exchange rate is JPY$82\mathrm{.}5/$$$.$

What currency is claimed to be $$undervalued$$ based on $$Big MacCurrency$?$

Group of answer choices

USD

JPY

It is fair$-$priced so no currency is undervalued.