add(backend) [比率计算]

operation-backend/src/main/java/com/idiot/operationbackend/support/Constants.java

@@ -137,7 +137,7 @@ public class Constants {
      */
     public static BigDecimal calcRate(long now, long before) {
         if (0 == before) {
-            return BigDecimal.valueOf((now*100.0)/1.0);
+            return BigDecimal.valueOf(100);
         } else if (0 == now) {
             return Constants.ZERO_RATE;
         }else {