calculate simple interest

//calculate simple interest
#include<stdio.h>
#include<math.h>
int main()
{
    float principle,time,rate,si;
    printf("Enter principle:\n");
    scanf("%f",&principle);
    printf("Enter time: \n");
    scanf("%f",&time);
    printf("Enter rate:\n");
    scanf("%f",&rate);
    si=(principle*time*rate)/100;/*simple interest =(principle*time*rate)/100 */
    printf("Simple Interest = %.2f",si);
    return 0;

}