Can you post the output from the program. Have you read the API doc for the binareySearch method to see what values it returns? Why do you think -21 is wrong?
When does the array; result get any non empty values? Have you printed out the contents of result to see what it is loaded with? How many elements does it have? Change the number of elements and see if the value of index changes.
public class GrossmontBank
//class variables (global - accessible throughout this class)
//scanner object to be used throughout
private static Scanner input = new Scanner(System.in);