fix(loan): Loan Tenure Formula (#18424)

diff --git a/erpnext/hr/doctype/loan_application/loan_application.py b/erpnext/hr/doctype/loan_application/loan_application.py
index 67be9f2..58a362d 100644
--- a/erpnext/hr/doctype/loan_application/loan_application.py
+++ b/erpnext/hr/doctype/loan_application/loan_application.py
@@ -33,8 +33,8 @@
 				if self.repayment_amount - min_repayment_amount < 0:
 					frappe.throw(_("Repayment Amount must be greater than " \
 						+ str(flt(min_repayment_amount, 2))))
-				self.repayment_periods = math.ceil(math.log(self.repayment_amount) -
-					math.log(self.repayment_amount - min_repayment_amount) /(math.log(1 + monthly_interest_rate)))
+				self.repayment_periods = math.ceil((math.log(self.repayment_amount) -
+					math.log(self.repayment_amount - min_repayment_amount)) /(math.log(1 + monthly_interest_rate)))
 			else:
 				self.repayment_periods = self.loan_amount / self.repayment_amount