diff --git a/app/models/training.rb b/app/models/training.rb
index 8bb9c6d3..8a1cc0c9 100644
--- a/app/models/training.rb
+++ b/app/models/training.rb
@@ -38,7 +38,7 @@ class Training < ActiveRecord::Base
       # 三人以上 8折
       num >= 3 ? 3000.0 * 0.8 * num : 3000.0 * num
     when 4 then
-      700.0 * num
+      500.0 * num
     else
       raise ArgumentError
     end