Getting my percent to always go out to the tenths place. [Java]

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pds12345 is in Java

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I am writing a method where I must always have one digit before the decimal and two digits after.

 public String getPercentage() throws      FractionDenominatorZeroException, LossOfPrecisionException{
    int value = 0;
    double percent = 0.0;
    value = sign*10000*numerator/denominator;
    percent = value / 100.0;

    return ""   percent   "%";
}

sign is either 1 or -1 depending on if my fraction is positive or negative. But when doing a calculation like 1/250 I get 0.4 and I need to get 0.40... I am unsure of how I could accomplish this so any help is greatly appreciated! Thank you!

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pds12345

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