public class CashDispenser
{
    // instance variables - replace the example below with your own
    private final static int INITIAL_COUNT = 500;
    private int count;

    public CashDispenser()
    {
        count = INITIAL_COUNT;
    }

    public void dispenseCash( int amount )
    {
        int billsRequired = amount / 20;
        count -= billsRequired;

    }

    public boolean isSufficientCashAvailable( int amount )
    {
        int billsRequired = amount / 20;

        if ( count >= billsRequired )
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}