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diff --git a/test/suite/intl402/ch12/12.3/12.3.2_5_b.js b/test/suite/intl402/ch12/12.3/12.3.2_5_b.js
new file mode 100644
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+++ b/test/suite/intl402/ch12/12.3/12.3.2_5_b.js
@@ -0,0 +1,34 @@
+// Copyright 2012 Google Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * @path intl402/ch12/12.3/12.3.2_5_b.js
+ * @description Tests that Intl.NumberFormat.prototype.format
+ * formats percent values properly.
+ * @author: Roozbeh Pournader
+ */
+
+var testcase = function() {
+  "use strict";
+
+  var numberFormatter = new Intl.NumberFormat();
+  var percentFormatter = new Intl.NumberFormat(undefined, {style: 'percent'});
+
+  var formattedTwenty = numberFormatter.format(20);
+  var formattedTwentyPercent = percentFormatter.format(0.20);
+
+  // FIXME: May not work for some theoretical locales where percents and
+  // normal numbers are formatted using different numbering systems.
+  if (formattedTwentyPercent.indexOf(formattedTwenty) === -1) {
+    $ERROR("Intl.NumberFormat's formatting of 20% does not include a " +
+        "formatting of 20 as a substring.");
+  }
+
+  // FIXME: Move this to somewhere appropriate
+  if (percentFormatter.format(0.011) === percentFormatter.format(0.02)) {
+    $ERROR('Intl.NumberFormat is formatting 1.1% and 2% the same way.');
+  }
+
+  return true;
+}
+runTestCase(testcase);