BigDecimal objects are immutable
suggest changeIf you want to calculate with BigDecimal you have to use the returned value because BigDecimal objects are immutable:
BigDecimal a = new BigDecimal("42.23");
BigDecimal b = new BigDecimal("10.001");
a.add(b); // a will still be 42.23
BigDecimal c = a.add(b); // c will be 52.231
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