Mortgage Calculator - Monthly Payment Is Not Getting Out Correctly

This is for a mortgage calculator and we have to use the math.pow method. I am getting results, but the results are wrong. The monthly payment is coming out to big.

Here is what it should be:

Enter loan amount: 10000
Enter rate: 4.5
Enter number years: 3

The monthly payment is: $297.47

Here is what I'm getting.

Enter loan amount: 10000
Enter rate: 4.5
Enter number years: 3

The monthly payment is: $566.06

Here is my code. I believe my issue is in the math.pow formula.

Scanner in = new Scanner(System.in); // input object

double loanAmount; //user input
double interestRate; // user input
double yearNumber; // user input
double monthlyPayment; // answer to math
double finalPayment; // output
double monthNumber; // year number converted of months
double monthlyRate; // converted intersted rate

[Code] ....

The monthly payment is: $%.2f", monthlyPayment); // Shows monthly payment