I am not going to help you with the complete solution as it seems to be your homework 😉
You should get compilation error on lines System.out.println(CalculateBill1());
because there is no method with definition as void parameter.
System.out.println(CalculateBill2());
System.out.println(CalculateBill3());
you need to pass appropriate parameters to call these methods. For example to call method “CalculateBill1 (double totalDue, double tax, double fees)” you need to call it like below:
System.out.println(CalculateBill1(1.25,5.23,6.0));
Hope this help.
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solved how to create java methods [closed]