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That statement could be coded in any method that is in the same class as the computePayment() method.


Then you need to have a statement that calls the method you want to execute and pass it...

When a method returns a value, the calling code needs to assign the returned value to a variable:

double someVar = computePayment(put needed args here);
someVar now has the value that was...

Are the methods you want to execute being called? If they are not called, they will not be executed.

Take a look at the tutorial:
Passing Information to a Method or a Constructor (The Java™...

Can you explain what the program does and what is "going wrong"?

What do you expect to happen when the code executes?

Please explain what the problem is.