调整利润返回格式，保留两位小数

Bailun.DC.Web/Controllers/ApiController.cs

@@ -437,9 +437,9 @@ namespace Bailun.DC.Web.Controllers
                     data = new
                     {
                         count = obj.id,
-                        amount_sales = obj.amount_sales,
-                        profit_total = obj.profit_total,
-                        profit_rate = obj.profit_rate
+                        amount_sales = obj.amount_sales.ToString("#0.00"),
+                        profit_total = obj.profit_total.ToString("#0.00"),
+                        profit_rate = (obj.profit_rate*100).ToString("#0.00"),
                     }
                 });
             }