Question: Think about the observer pattern can help to decouple UI layer from model layer, design a tax calculation with max 4 classes that use packages

Think about the observer pattern can help to decouple UI layer from model layer, design a tax calculation with max 4 classes that use packages for view and model layers, make a class diagram that shows the view and the model and what classes are in this packages, a sequence diagram that shows the behavior of the system and a simple Java implementation. The next model class must be part of the system.

TaxCalculation

getTax()

addIncome(income)

setTaxPercent(taxPrecent)

I need help to start, I'm lost and I can make it work with the observer pattern

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