diff --git a/app/src/main/java/com/duy/calculator/activities/base/BaseEvaluatorActivity.java b/app/src/main/java/com/duy/calculator/activities/base/BaseEvaluatorActivity.java
index 61093097..53d462b4 100644
--- a/app/src/main/java/com/duy/calculator/activities/base/BaseEvaluatorActivity.java
+++ b/app/src/main/java/com/duy/calculator/activities/base/BaseEvaluatorActivity.java
@@ -223,7 +223,7 @@ public void onSuccess(ArrayList<String> result) {
                 mBtnClear.setEnabled(true);
 
                 for (String entry : result) {
-                    mResultAdapter.addItem(new ResultEntry("", entry));
+                    mResultAdapter.addItem(new ResultEntry("", entry.charAt(2)=='-'?"$$"+entry.substring(3):entry));
                 }
 
                 if (mResultAdapter.getItemCount() > 0) {