calculate the simple interest-C

#include
#include
void main()
{
float p,r,n,si;
clrscr();
printf("\nEnter the profit, rate & no of yr\n\n ");
scanf("f%f",&p,&r,&n);
si=(p*r*n)/100;
printf("\nSimple Intrest=%f",si);
getch();
}