report profit loss

lib/common/function/app_function.dart

@@ -44,3 +44,13 @@ Map<String, int> getChairDistribution(int capacity) {
     return {'top': side, 'bottom': side, 'left': 1, 'right': 1};
   }
 }
+
+double safeDouble(double value) {
+  if (value.isNaN || value.isInfinite) return 0.0;
+  return value;
+}
+
+int safeRound(double value) {
+  if (value.isNaN || value.isInfinite) return 0;
+  return value.round();
+}