what is the problem in this code

package ATM;

public class Example { double newBalance; public double operation(double balance,double withdrawl) {

if(withdrawl%5 !=0)
{
    System.out.println("Please Withdraw in multiple of 5");
}   
else if(withdrawl>balance+0.50)
{
    System.out.println("Not Enough Money");
}
else
{
    System.out.println("Withdrawl Successful");
    newBalance=balance-(withdrawl+0.50);
}

return newBalance;
} public static void main(String args[]) { Example ex=new Example(); double balance=200; double w=25; double newbalance=ex.operation(balance,w); if(newbalance!=0.00) {
System.out.println(newbalance); } else { System.out.println(balance); }
}

}