Round the decimal with coefficient

RoundingWithCoefficient.java

// amount = 1.2244 with round 0.003 will be 1.23, with round 0.005 will be 1.22, with round 0.03 will be 1.3
    public static String taxFormat(double taxAmount, double round) {

        try {

            String extensionRemoved = String.valueOf(round).split("\\.")[1];

            int sigCount = extensionRemoved.length() - 1;

            double addjust = 1.0;

            for (int i = 0; i < sigCount; i++) {

                addjust = addjust/10.0;
            }

            double coefficient = addjust - round;

            taxAmount = taxAmount + coefficient;

            BigDecimal bigDecimal = new BigDecimal(taxAmount);
            bigDecimal = bigDecimal.setScale(sigCount, BigDecimal.ROUND_DOWN);

            //bigDecimal.doubleValue();

            String value = String.valueOf(bigDecimal);

            return value;

        } catch (Exception e) {

            e.printStackTrace();
        }

        return String.valueOf(taxAmount);
    }