C Program to calculate simple interest

#include<stdio.h>
int main()
{
    float p,t,r,SI;
    printf("Enter the principle amount\n");
    scanf("%f",&p);
    printf("Enter time\n");
    scanf("%f",&t);
    printf("Enter the rate of interest\n");
    scanf("%f",&r);
    SI=(p*t*r)/100;
    printf("The sum is : %f\n",SI);
}

Output: