Python compiler throwing an error while executing the program ca not defined

Hi Team,

Iam trying to run the below code in python , Iam getting an error while calculating the ca value .Kindly help me with the casue of the error
''' write a program to calulate the gross salary of the employee
if his basic salary less than 2000 then HRA 10% of basic salary
DA 90% of basic salary , ca=10
> 2000 , hra 5%  bs and da 20 percent of basic salary '''

basicSalary=int(input("Enter the basic salary"))
if basicSalary < 2000:
      hra=basicSalary * 0.1
      da=basicSalary * 0.9
      ca=10
else:
      hra=basicSalary * 0.05
      da=basicSalary * 0.2

grossSalary=basicSalary+hra+da+ca
print (" the gross salary of employees is ",grossSalary)


C:\Users\sam\Desktop\MyPythonPrograms>python mypythonIf3.py
Enter the basic salary2300
Traceback (most recent call last):
  File "mypythonIf3.py", line 15, in <module>
    grossSalary=basicSalary+hra+da+ca
NameError: name 'ca' is not defined