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Convert foreign currency calculation result to US $
When you shop abroad, your brain always converts the local currency of the destination to the US dollar. Based on the conversion result, you should be judging whether it is cheap or expensive.
It is a difficult task to calculate the conversion to US dollars at the same time when making a subtle decision whether to buy or not.
It is a useful calculator at such time.
It is a smartphone application of the button arrangement of the general calculator.