A DESCRIPTION OF THE PROBLEM :
 question code
Long sellerSettleMoney = new BigDecimal(param.getBaseMoney())
                .multiply(new BigDecimal(sellerPercent))
                .divide(percentDecimal, 0, BigDecimal.ROUND_HALF_UP).longValue();

SettleParam param = new SettleParam();
            param.setBaseMoney(12800L);
            param.setTemplateId("N_1");
            Map<IdentityEnum, String> paramsMap = new HashMap<IdentityEnum, String>(16);
            paramsMap.put(IdentityEnum.PLATFORM, "50");
            paramsMap.put(IdentityEnum.SELLER, "50");

    public static void main(String[] args) throws Exception {
        SettleParam param = new SettleParam();
        param.setBaseMoney(1800L);
        param.setTemplateId("N_1");
        Map<IdentityEnum, String> paramsMap = new HashMap<IdentityEnum, String>(16);
        paramsMap.put(IdentityEnum.PLATFORM, "50");
        paramsMap.put(IdentityEnum.SELLER, "50");
        param.setParamsMap(paramsMap);
        SettleCalculateResult result = SettleCalculate.calculate(param);
        System.out.println(result.getSettleResultMap().get(IdentityEnum.PLATFORM).getExpression());
        System.out.println(result.getSettleResultMap().get(IdentityEnum.PLATFORM).getSettleMoney());
        System.out.println(result.getSettleResultMap().get(IdentityEnum.SELLER).getExpression());
        Long sellerMoney = result.getSettleResultMap().get(IdentityEnum.SELLER).getSettleMoney();
        System.out.println(sellerMoney);
    }

result: sellerMoney = 901 The correct result should be 900
why？What are the possibilities？


FREQUENCY : rarely