diff --git a/yuthon_property_approval/models/property_lease_contract.py b/yuthon_property_approval/models/property_lease_contract.py
index 1b176f17c..d222104ab 100644
--- a/yuthon_property_approval/models/property_lease_contract.py
+++ b/yuthon_property_approval/models/property_lease_contract.py
@@ -490,7 +490,7 @@ class PropertyLeaseContract(models.Model):
                     unit_price = unit_price + self.increment_value
                     monthly_amount = self.total_area * unit_price
                 if self.increment_method == "percentage" and self.increment_value:
-                    monthly_amount = monthly_amount * self.increment_value
+                    monthly_amount = monthly_amount * (1 + (self.increment_value / 100))
                     unit_price = monthly_amount / self.total_area
                 if self.increment_method == "increment_amount" and self.increment_value:
                     monthly_amount = monthly_amount + self.increment_value