Problem
As a tourist, it is always a hassle to convert prices in your head or using a calculator from the local currency to the one you are used to operating with. Also, different countries exclude taxes from the displayed price, which adds even more calculations one has to make to understand how much something costs.
Solution
AR mobile app with text recognition and updating currency exchange rates allowing users to point the camera at the price tag and see the price in their desired currency, including all taxes and other extra charges.