diff --git a/chardet/latin1prober.py b/chardet/latin1prober.py
index abaaf98..c8bc405 100755
--- a/chardet/latin1prober.py
+++ b/chardet/latin1prober.py
@@ -130,10 +130,10 @@ def get_confidence(self):
         if total < 0.01:
             confidence = 0.0
         else:
-            confidence = (self._mFreqCounter[3] / total) - (self._mFreqCounter[1] * 20.0 / total)
+            confidence = (self._mFreqCounter[3] - self._mFreqCounter[1] * 20.0) / total
         if confidence < 0.0:
             confidence = 0.0
         # lower the confidence of latin1 so that other more accurate detector
         # can take priority.
-        confidence = confidence * 0.5
+        confidence = confidence * 0.73
         return confidence