<?php

$bank = array(
            '2000' => 0,
            '1000' => 0,
            '500' => 0,
            '200' => 0,
            '100' => 0,
            '50' => 0,
            '20' => 0,
            '10' => 0,
            '5' => 0,
            '2' => 0,
            '1' => 0
            );

$income = array(
            '500' => 3,
            '100' => 1,
            '20' => 6,
            '10' => 4,
            '5' => 5,
            '2' => 2,
            '1' => 8
            );