Taxes

#include<stdio.h>
int main()
{
    float salary,taxsalary,tax;
    scanf("%f",&salary);
    if(salary>=0.00 && salary<=2000.00)
    {
        printf("Isento\n");
    }
    else if(salary>2000.00 && salary<=3000.00)
    {
        taxsalary=salary-2000.00;
        tax=taxsalary*0.08;
        printf("R$ %.2f\n",tax);
    }
    else if(salary>3000.00 && salary<=4500.00)
    {
        tax=1000.00*0.08+(salary-3000.00)*0.18;
        printf("R$ %.2f\n",tax);
    }
    else if(salary>4500.00)
    {
        tax=(1000*0.08)+(1500*0.18)+(salary-4500.00)*0.28;
        printf("R$ %.2f\n",tax);
    }
    return 0;
}