Consider the program:

#include <stdio.h>

//main program
int main()
{
	//variable to store values
	float basic, da, hra, ta, others;
	float pf,it;
	float net_salary;
	
	//input required fields
	printf("Enter Basic Salary ($): ");
	scanf("%f",&basic);
	printf("Enter HRA ($): ");
	scanf("%f",&hra);
	printf("Enter TA ($): ");
	scanf("%f",&ta);	
	printf("Enter others ($): ");
	scanf("%f",&others);	
	
	//calculate DA 12% of Basic Salary
	da = (basic*12)/100;
	//calculate PF 14% of Basic salary
	pf = (basic*14)/100;
	//calculate IT, 15% of Basic salary
	it = (basic*15)/100;
	
	//calculate net salary
	net_salary = basic + da + hra + ta + others - (pf+it);
	
	//printing Net salary
	printf("Net Salary is: $ %.02f\n",net_salary);
	
	return 0;
}

Output

Enter Basic Salary ($): 12000
Enter HRA ($): 150 
Enter TA ($): 120
Enter others ($): 450
Net Salary is: $ 10680.00