Calculate simple interest.

//Program to calculate simple interest.
#include<iostream.h>
#include<conio.h>
void main()
{
    clrscr();
    float a,b,c,d,e;
    cout<<"Enter principal: ";
    cin>>a;
    cout<<"Enter rate% : ";
    cin>>b;
    cout<<"Enter time in years: ";
    cin>>c;
    a=a*b*c/100;
    cout<<"The simple interest is: "<<a;
    getch();
}