https://hastebin.com/leyiqeyemo.xml
                  
                  
                  
                  
                  
                  which of it performs better and maintainable?
                  
                  
                  i personally go for #1
                  
                  
                
I wouldn't store the employee in the calculator, just pass it when calling the methods. That way you only need one instance of it and is easier to test.
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