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Good Luck.

It's not an error but it is coz the variable loanLengthInMonths is not being used anywhere after assigning value to it.

Also, i don't know what you are supposed to do, might be the problem in your...

(1 - Math.pow((1 + monthlyInterest), loanLengthInYears))

It's giving the negative value.

Well, i don't know why aren't you trying to understand what i mean to say.
Simply,


double annualInterest = 5.75; //This is the annual interest rate
double loanAmount = 200000; //This is the...

Can you copy the errors and paste here?

Does this program even compiling? If no, paste here the errors/exceptions.