Program to find simple interest in C code

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#include<stdio.h>
#include<conio.h>
void main()
{
   float p,r,t,si;
   clrscr();
   printf("Enter the principle  ");
   scanf("%f",&p);
   printf("Enter the rate of interest per annum  ");
   scanf("%f",&r);
   printf("Enter the time period in years ");
   scanf("%f",&t);
   si=(p*r*t)/100.00;
   printf("\nSimple interest for given values is %f",si);
   getch();
}
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