code: public static double subAmounts(final double n1, final double n2) {
  		final BigDecimal b1 = new BigDecimal(n1);
  		final BigDecimal b2 = new BigDecimal(n2);
  		BigDecimal b3 = b1.subtract(b2);
  		b3 = b3.setScale(3, BigDecimal.ROUND_HALF_UP);
  		final double result = b3.doubleValue();
  		return result;
  	}
docs: Sub amounts.
  
  @param n1 the n 1
  @param n2 the n 2
  @return the double