Uri 1048 salary increase

#include<stdio.h>
int main()
{
    float a;
    double i;
    char c='%';
    int r;
    double total;
    scanf("%f",&a);
    if(a>=0 && a<=400)
    {
        i= (15*a)/100;
        total=a+i;
        r= 15;
    }
    if(a>=400.01 && a<=800)
    {
        i=(12*a)/100;
        total=a+i;
        r=12;
    }
    if(a>=800.01 && a<=1200)
    {
        i=(10*a)/100;
        total=a+i;
        r=10;
    }
    if(a>=1200.01 && a<=2000)
    {
        i=(7*a)/100;
        total=a+i;
        r=7;
    }
    if(a>2000)
    {
        i=(4*a)/100;
        total=a+i;
        r=4;
    }
    printf("Novo salario : %.2f\n",total);
    printf("Reajuste ganho : %.2f\n",i);
    printf("Em percentual : %d %c\n",r,c);
    return 0;
}