diff --git a/ta_cola.html b/ta_cola.html
index 1a41da9..f0d6cc5 100644
--- a/ta_cola.html
+++ b/ta_cola.html
@@ -316,7 +316,7 @@ <h5 class="card-header">Cost adjustment by location</h5>
     var lead_ta = course[0];
     var ta = course[1];
     
-    theStr = Math.round((country * lead_ta + lead_ta)/2) + ' USD' + ' / ' + Math.round((country * ta + ta)/2) + ' USD' + ' -- (LeadTA/TA)'
+    theStr = Math.round((0.5 + 0.5 * country) * lead_ta) + ' USD' + ' / ' + Math.round((0.5 + 0.5 * country) * ta) + ' USD' + ' -- (LeadTA/TA)'
     
     document.getElementById('costs').innerHTML = theStr;
   }