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L2: UI

Turned out calculating prices by running a function on a computer is neither pleasant nor fool-proof. Your aunt want to have an user interface to do that from anywhere using her computer or mobile devices. The problem is very interesting so you’re eager to develop this despite having very little free time.
1-person exercise
You can use any technologies, third party libraries, or frameworks.
Provide an outline and mock-ups before developing
The purpose of the mock-ups is to make sure your design will be usable by any cashiers.
The interface should prevent users from making mistakes or show them appropriate errors.
Should be useable on any browsers and screen sizes without installing additional softwares.
Provide UI in both English and Vietnamese
Don’t need to translate everything, just need to demonstrate that it can be done
Drink types should also be in both languages
How would you test the UI?

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