Round percentage value to nearest number

I wanted to convert a number which is in string format to a percentage value with one decimal point. Below is my sample input and expected output.

Expected results:

"0.0195" => "2.0%"

"0.0401" => "4.0%"

I know this may be a simple question but I am not able to find the exact solution for this using java APIs, I tried all the rounding modes present under RoundingMode enum, but no rounding mode gives my expected result. Could you please help, I may be missing something.

import java.math.RoundingMode;
import java.text.NumberFormat;

public class RoundingModeExample {
    public static void main(String[] args) {
        System.out.println(formatPercentage("0.0195") + "(expected 2.0%)");
        System.out.println(formatPercentage("0.0401") + "(expected 4.0%)");
    }

    private static String formatPercentage(String number) {
        String formattedValue = "";
        NumberFormat numberFormat = NumberFormat.getPercentInstance();
        numberFormat.setMinimumFractionDigits(1);
        numberFormat.setRoundingMode(RoundingMode.HALF_UP);
        try {
            formattedValue = numberFormat.format(Double.valueOf(number));
        } catch (NumberFormatException e) {
            formattedValue = number;
        }
        return formattedValue;
    }


}

Output of the above program:

1.9%(expected 2.0%)

4.0%(expected 4.0%)

The problem with 0.0195 is that there is no double precision number that is exactly mathematically equal to it. When you write 0.0195 in program source code or parse the string "0.0195" into double, the number you get is actually a little bit less. That's why the formatter rounds it to 1.9%.

You can get around this by not using the double data type at all:

formattedValue = numberFormat.format(new BigDecimal(number));