Write a program to find the simple interest

#include<stdio.h>
#include<conio.h>
int main()
{
float a,r,t,s;
printf("principle amount");
scanf("%f",&a);
printf("rate of interest");
scanf("%f",&r);
printf("no of years");
scanf("%f",&t);
s=(a*r*t)/100;
printf("\nsimple interest is %f",s);
}