simple interest

#include<stdio.h>
#include<conio.h>
void main()
{
int p,r,t,si;
printf("enter principal");
scanf("%d",&p):
printf("enter rate");
scanf("%d",&r);
printf("enter time");
scanf("%d",&t);
si=(p*r*t)/100;
printf("si=%d",si);
getch();
}