C code is compiling but not giving the desired output.

Question

I am a beginner. I am trying to write a simple code to calculate the salary. although it is getting compiled but I am not being able to get the desired output.

 

#include
int main()
{
float a, b, c, d;

printf("Basic salary = \n");
scanf("%f", &a);
b = (40/100)*a;
c = (20/100)*a;
d = b + c;

printf("Gross Salary = %f\n", a+d);
return 0;


}

 

 

If I put Basic salary as = 1000.00

I should get Gross salary as 1600.00

but I am getting gross salary same as the basic salary.

please help!