C Program to find the simple and compound interest

#include<stdio.h>
#include<math.h>
int main()
{
        int p,t;
        float r,si,amount,ci;
        printf("Please enter principal,time and rate of interest");
        scanf("%%d%%d%%f",&p,&t,&r);
        si=p*t*r/100;
//Simple Interest formula is p*t*r
        printf("\nSimple interest = %%.3f",si);
//Compound Interest formula is below
        amount=p*pow((1 +r/100),t);
        ci=amount-p;
        printf("\nCompound interest = %%.3f",ci);
}