simple interest from float in c programming

 #include<stdio.h>

int main()

{

    float p,r,t;

    float si;

    printf("Enter principle\n");

    printf("Enter rate\n");

    printf("Enter time\n");

    scanf("%f%f%f", &p,&r,&t);

    si=p*r*t/100;

    printf("calculate of %f", si);

    return 0;

}